Woody Harrelson (born July 23, 1961): The actor we met as dim-bulb bartender Woody on the sitcom "Cheers" went on to acclaim in such films as "White Men Can't Jump," "Natural Born Killers," "The People vs. Larry Flynt," and "The Hunger Games." He's also well known for his support of legalizing marijuana and hemp and for his environmental activism.
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Daniel Radcliffe (born July 23, 1989)
Daniel Radcliffe (born July 23, 1989): The actor played Harry Potter for almost half his life, from ages 11 to 21. He has also appeared frequently on stage, starring in the London and New York productions of the play "Equus" and in the 2011 Broadway revival of the musical "How to Succeed in Business Without Really Trying."
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Jennifer Lopez (born July 24, 1969)
Jennifer Lopez (born July 24, 1969): This multi-hyphenated Leo got her start as a dancer (a Flygirl, specifically) on the TV comedy show "In Living Color" in 1991. She then moved into acting with a starring role in the movie "Selena." She recorded her first album in 1999.
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Kevin Spacey (born July 26, 1959)
Kevin Spacey (born July 26, 1959): Many of us first encountered this versatile actor in "The Usual Suspects," in which he played the enigmatic Keyser Söze (sorry if that's a spoiler).
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Mick Jagger (born July 26, 1943)
Mick Jagger (born July 26, 1943): He can't get no satisfaction, but as he turns 71, perhaps the rubber-lipped lead singer of the Rolling Stones would rather have an early dinner and a good night's sleep.
Sandra Bullock (born July 26, 1964)
Sandra Bullock (born July 26, 1964): The actress and longtime holder of the America's Sweetheart title is best known for her roles in "Speed," "Miss Congeniality," "The Proposal," "Gravity" and "The Blind Side," for which she won a Best Actress Oscar.
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Elizabeth Gillies (born July 26, 1993)
Elizabeth Gillies (born July 26, 1993): The actress-singer-dancer is best known for playing Jade West in the Nickelodeon show "Victorious."
Cher Lloyd (born July 28, 1993)
Cher Lloyd (born July 28, 1993): The singer came to notice as a contestant on the British talent program "The X Factor." She went on to record the No. 1 U.K. hit "Swagger Jagger."
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Monica Lewinsky (born July 23, 1973)
Monica Lewinsky (born July 23, 1973): Monica Lewinsky is seen at the The Masterpiece Marie Curie Party in London on Monday, June 30, 2014. (Photo by Jon Furniss/Invision/AP)
Arnold Schwarzenegger (born July 30, 1947)
Arnold Schwarzenegger (born July 30, 1947): Now here's an uber-Leo. The bodybuilder, actor and former California governor fits this description from horoscope.com to a tee: "When the mighty Lion enters center stage, everyone notices. This dramatic, creative, and outgoing sign has the keyword magnetism for good reason. Fiery and self-assured, a Leo's charm can be almost impossible to resist."
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Hilary Swank (born July 30, 1974)
Hilary Swank (born July 30, 1974): Happy 40th birthday to the two-time Oscar-winning actress ("Boys Don't Cry" and "Million Dollar Baby").
Anita Hill (born July 30, 1956)
Anita Hill (born July 30, 1956): Hill became know worldwide in 1991, when she was subpoenaed to testify before the Senate Judiciary Committee about alleged sexual harassment by Clarence Thomas, who went on to narrowly win confirmation to the Supreme Court. She is now professor of social policy, law and women's studies at Brandeis University's Heller School for Social Policy and Management.
Laurence Fishburne (born July 30, 1961)
Laurence Fishburne (born July 30, 1961): There aren't many actors who could be plausible both as Morpheus in the "Matrix" science fiction film trilogy and as Cowboy Curtis on "Pee-wee's Playhouse." Fishburne is one versatile Leo!
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Wesley Snipes (born July 31, 1962)
Wesley Snipes (born July 31, 1962): The actor is most famous for his action movies, including the "Blade" trilogy, "Passenger 57" and "Demolition Man." Snipes was released from prison in 2013 after serving a three-year sentence for failing to file income tax returns.
Martin Sheen (born Aug. 3, 1940)
Martin Sheen (born Aug. 3, 1940): To many, Sheen will always be the fictitious President Josiah Bartlet on "The West Wing." To others, he was unforgettable in his younger days, including his roles in "Badlands" and "Apocalypse Now." Still others know him simply as Charlie Sheen's father.
Tom Brady (born Aug. 3, 1977)
Tom Brady (born Aug. 3, 1977): The handsome New England Patriots quarterback is famous for his exploits both on and off the gridiron. He has taken his team to three Super Bowl wins and he's married to supermodel Gisele Bundchen.
Billy Bob Thornton (born Aug. 4, 1955)
Billy Bob Thornton (born Aug. 4, 1955): Perhaps best known as Angelina Jolie's ex-husband (it was his fifth marriage), the "Sling Blade" star has had a busy career since the split. He has headlined "Bad Santa," "Bad News Bears" and other movies, plus he has taken up singing and songwriting.
President Barack Obama (born Aug. 4, 1961)
President Barack Obama (born Aug. 4, 1961): The President is the fourth Leo to have held the office. The others were Benjamin Harrison, Herbert Hoover and Bill Clinton.
Loni Anderson (born Aug. 5, 1945)
Loni Anderson (born Aug. 5, 1945): She was the bombshell receptionist on TV's "WKRP in Cincinnati." Anderson was married to Burt Reynolds from 1988 to 1993.
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Charlize Theron (born Aug. 7, 1975)
Charlize Theron (born Aug. 7, 1975): South African-born Charlize Theron first made a name for herself in "The Devil's Advocate," "Mighty Joe Young" and "The Cider House Rules," but none of those roles prepared audiences or critics for her Oscar-winning performance in "Monster."
David Duchovny (born Aug. 7, 1960)
David Duchovny (born Aug. 7, 1960): David Duchovny starred in one of the long-running, beloved TV show "The X-Files." Since 2007 he's played the lead role in "Californication."
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Dustin Hoffman (born Aug. 8, 1937)
Dustin Hoffman (born Aug. 8, 1937): This Leo has been a lion of Hollywood since 1967, when he played a confused college grad in "The Graduate." Some of his most acclaimed films include "Midnight Cowboy," "Lenny," "All the President's Men," "Tootsie," and "Rain Man."
Melanie Griffith (Aug. 9, 1957)
Melanie Griffith (Aug. 9, 1957): The daughter of "The Birds" star Tippi Hendren has led a Hollywood life from the start. At 15, she moved in with Don Johnson (they married briefly when she turned 18, then again in the late 1980s), she became an A-lister with "Working Girl." She has struggled with drug and alcohol addiction and married fellow Leo Antonio Banderas in 1996; they split up in 2014.
Antonio Banderas (born Aug. 10, 1960)
Antonio Banderas (born Aug. 10, 1960): The Spanish actor began his career in a series of films by director Pedro Almodóvar. He moved on to Hollywood movies in the 1990s, notably with roles in "Evita," "Interview with the Vampire," "Philadelphia," "Desperado," and "The Mask of Zorro." He's separated from his wife of 18 years, Leo Melanie Griffith.
Hulk Hogan (Aug. 11, 1953)
Hulk Hogan (Aug. 11, 1953): Happy 61st birthday to the reality TV star and former pro wrestler!
Chris Hemsworth (born Aug. 11, 1953)
Chris Hemsworth (born Aug. 11, 1953): The hunky Australian actor has starred in many high-profile Hollywood movies, including "Thor," "The Avengers" and "Snow White and the Huntsman."
Pete Sampras (born August 12, 1971)
Pete Sampras (born August 12, 1971): In his heyday, retired tennis champ Sampras was pretty much unbeatable. During his 14-year tour career, he won 14 Grand Slam singles titles, and was the year-end world no. 1 playter for six consecutive years (1993–1998).
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Mila Kunis (born Aug. 14, 1983)
Mila Kunis (born Aug. 14, 1983): Happy 31st birthday to this "That '70s Show" alum and star of "Black Swan," "Ted," and "Oz the Great and Powerful." She has also voiced Meg Griffin on "Family Guy" since 1999. She and "That '70s Show" co-star Ashton Kutcher are now a couple and expecting a baby together.
Halle Berry (born Aug. 14, 1966)
Halle Berry (born Aug. 14, 1966): The newlywed actress (she married actor Olivier Martinez in July 2013) won an Oscar for her "Monster's Ball" performance in 2002 and has starred in the "X-Men" franchise.
Magic Johnson (born Aug. 14, 1969)
Magic Johnson (born Aug. 14, 1969): The former NBA player won five championships with the Lakers during the 1980s, then abruptly retired in 1991, announcing he was HIV positive. Johnson has been an advocate for HIV/AIDS prevention and safe sex, as well as an entrepreneur, philanthropist, broadcaster and motivational speaker.
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Joe Jonas (born Aug. 15, 1989)
Joe Jonas (born Aug. 15, 1989): Happy birthday to the middle brother of the three singing, acting Jonas Brothers. In 2008, he dated singer Taylor Swift, who did indeed write songs about their breakup.
Jennifer Lawrence (born Aug. 15, 1990)
Jennifer Lawrence (born Aug. 15, 1990): Just now turning 24, the actress has already won Academy and Golden Globe awards for her work in "Silver Linings Playbook," as well as a worldwide following for her starring role in "Hunger Games." Time magazine named her one of the 100 most influential people in the world in 2013.
Ben Affleck (born Aug. 15, 1972)
Ben Affleck (born Aug. 15, 1972): The actor-writer-director has ridden Hollywood's roller coaster since he co-wrote "Good Will Hunting" with Matt Damon and won an Oscar for it in 1998. He has had ups ("Argo") and downs (remember "Gigli"?), but now this Leo seems to be back in top form.
Madonna (born Aug. 16, 1958)
Madonna (born Aug. 16, 1958): She got into the groove 30 years ago and seems never to have left it. The singer endures as one of the world's biggest stars: she's the best-selling female recording artist of all time.
Steve Carell (born Aug. 16, 1962)
Steve Carell (born Aug. 16, 1962): The "Daily Show" alum went on to create a TV legend with his Michael Scott character on "The Office." Now Carell devotes his time to movies, including such comedies as "The 40-Year-Old Virgin," "Little Miss Sunshine" and "The Way Way Back." He's also the voice of Gru in the "Despicable Me" animated movies.
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Sean Penn (born Aug. 17, 1960)
Sean Penn (born Aug. 17, 1960): It seems odd now that his role as stoner surfer Jeff Spicoli introduced Penn to the world in 1982's "Fast Times at Ridgemont High." Since then, the actor has focused almost exclusively on serious roles in films such as "Dead Man Walking," "Mystic River" and "Milk." He's equally well known for his left-wing political and social activism.
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Robert De Niro (born Aug. 17, 1943)
Robert De Niro (born Aug. 17, 1943): One of the most acclaimed actors of his generation, De Niro starred in a slew of Martin Scorsese films, including "Mean Streets," "Raging Bull" and "Taxi Driver." He has been nominated for seven Academy Awards over the years, winning two, for "Taxi Driver" and "The Godfather, Part II."
Edward Norton (Aug. 18, 1969)
Edward Norton (Aug. 18, 1969): Norton is known for playing a wide range of roles, in such diverse films as "Primal Fear," "American History X," "Fight Club," and most recently "The Grand Budapest Hotel."
Robert Redford (born Aug. 18, 1936)
Robert Redford (born Aug. 18, 1936): The man behind the Sundance Film Festival began his film career in the 1960s and shot to superstardom in the 1970s in "Butch Cassidy and the Sundance Kid," "The Sting," and "All the President's Men," among many other box office and critical hits. In 2013 he was the sole actor in the man-lost-at-sea drama "All Is Lost."
Christian Slater (born Aug. 18, 1969)
Christian Slater (born Aug. 18, 1969): The actor made an explosive impression in "Heathers," opposite Winona Ryder in 1988. He followed up with big roles in "True Romance," "Interview with the Vampire," and "Robin Hood," among others. He recently starred in the Fox TV comedy "Breaking In."
Denis Leary (born Aug. 18, 1957)
Denis Leary (born Aug. 18, 1957): The versatile actor and comedian co-created and starred in the television show "Rescue Me" and in the movies "The Matchmaker," "The Ref" and "Demolition Man."
Bill Clinton (born Aug. 19, 1946)
Bill Clinton (born Aug. 19, 1946): The former president has kept himself busy since leaving office after the 2000 election. He created the William J. Clinton Foundation with the mission to "strengthen the capacity of people throughout the world to meet the challenges of global interdependence," and he has a full schedule of public speaking engagements and fundraising efforts. He's also married to the possible next Democratic presidential nominee.
Matthew Perry (born Aug. 19, 1969)
Matthew Perry (born Aug. 19, 1969): That's right, Chandler Bing is 45. Could that *be* any more unbelievable? Since "Friends" left our living rooms, Perry has appeared or starred in a number of show, but he'll always be Bing to us.
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Romeo (born Aug. 19, 1989)
Romeo (born Aug. 19, 1989): The rapper -- whose full name is Romeo Miller and who used to go by Lil' Romeo -- comes from a hip hop dynasty. He's the son of rapper and entrepreneur Master P and former rapper Sonya C. He has released four albums himself. Romeo has also done some modelling and appeared on "Dancing with the Stars" twice.
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Matthew Broderick (born Aug. 21, 1962)
Matthew Broderick (born Aug. 21, 1962): It's still hard to look at this actor without thinking, "Bueller? Bueller?" After his most famous role, Broderick has appeared in many movies, but he's made his most lasting impressions on stage, in "How to Succeed in Business Without Really Trying" and "The Producers." He's married to actress Sarah Jessica Parker, and the couple have three children.
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Usain Bolt (born Aug. 21, 1986)
Usain Bolt (born Aug. 21, 1986): The fortuitously named Jamaican sprinter arguably is the fastest person ever. He's the first man to win gold medals in both the 100- and 200-meter races at consecutive Olympic Games (2008 and 2012).
Valerie Harper (born Aug. 22, 1939)
Valerie Harper (born Aug. 22, 1939): The actress played brash New Yorker best friend Rhoda Morgenstern to the sweet Midwestern eponymous main character on "The Mary Tyler Moore Show." Harper also starred in the spin-off, "Rhoda." In March 2013, she was diagnosed with brain cancer.