The Iron Man II star keeps her body toned with trainer Tracy Anderson, who counts Madonna as a former client. Paltrow turns 38 this month. (credit:Dimitrios Kambouris/Getty Images)
Salma Hayek, September 2, 1966
Hayek most recently starred in the movie Grown-Ups with Adam Sandler. She turns 44 this year. (credit: Stephen Lovekin/Getty Images)
Beyonce Knowles, September 4, 1981
Knowles, aka Sasha Fierce, turns 29. (credit: Jason Kempin/Getty Images)
Prince Harry of Wales, September 15, 1984
The younger and 'more adventurous' son of Prince Charles and the late Diana Princess of Wales is turning 26 this month. (credit: Ben Stansall - WPA Pool/Getty Images)
Will Smith, September 25, 1968
Will Smith has the same birthday as his lady love, Jada Pinkett Smith. He turns 42 this year. (credit: Gareth Cattermole/Getty Images)
The actress and style icon has come a long way from her Dawson’s Creek days. She’s turning 30, and wowed at the 67th Venice Film Festival. (credit: Pascal Le Segretain/Getty Images)
Nick Jonas, September 16, 1992
Attention cougars: Nick Jonas will finally be an adult this September—the little jo bro will turn 18. (credit: Jemal Countess/Getty Images)
Catherine Zeta-Jones, September 25, 1969
Zeta-Jones shares a birthday with her husband Michael Douglas, who is battling throat cancer. She turns 41 this month. (credit: Bryan Bedder/Getty Images)
Ludacris, September 11, 1977
“Luda,” born Christopher Bridges, provided one of the hits of the summer with Break Your Heart. The singer and actor turns 33 this year. (credit: Jemal Countess/Getty Images)
Pink, September 8, 1979
Songstress Pink, born Alecia Moore, tweeted that she suffered from a separated shoulder while on tour earlier this year. But that didn’t stop her from celebrating her 31st birthday. (credit: Jason Merritt/Getty Images)
Michael Douglas, September 25, 1944
(credit: Andrew H. Walker/Getty Images)
T-Pain, September 20, 1985
The 'King of Autotune' will soon be 25 years old. (credit: Kevork Djansezian/Getty Images)
Sophia Loren, September 20, 1934
Loren proves that sexy doesn’t have an age. The star turns 76 this month. (credit: Kevork Djansezian/Getty Images)
Shaun White, September 3, 1986
Affectionally called the “flying tomato,” the two-time Olympic gold medalist turns 24 this month. (credit: Jason Merritt/Getty Images)
Serena Williams, September 26, 1981
American tennis superstar Williams turns 29 this month. (credit: Stephen Lovekin/Getty Images for Conde Nast)
Ryan Phillippe, September 10, 1974
The Macgruber star Phillippe turns 36. (credit: Bryan Bedder/Getty Images)
Jennifer Hudson, Septembe 12, 1981
The singer, actor and new mother has more than her new svelte figure to celebrate. Hudson is turning 28. (credit: Michael Buckner/Getty Images)
Rose McGowan, September 5, 1973
McGowan is best-known for the WB Network show Charmed. She turns 37 this month. (credit: Frederick M. Brown/Getty Images)
Raquel Welch, September 5, 1940
Welch doesn't need a deerskin bikini to be a sex symbol at 70. (credit: Bryan Bedder/Getty Images)
Tyler Perry, September 14, 1969
Perry was ranked as the sixth highest-paid man in Hollywood by Forbes Magazine last year. This year, he turns 41. (credit: Stephen Lovekin/Getty Images)
Naomi Watts, September 28, 1968
Watts has been voted one of the Twenty People Who’ve Gotten More Attractive with Age by Nerve. We think her husband, Liev Schreiber, agrees. The actress turns 42 this month. (credit: Bryan Bedder/Getty Images)
Heidi Montag, September 15, 1986
Montag has arguably become more famous for her transforming body than for her reality stardom. The soon to be 24 year old recently announced to Lifestyle Magazine that she is downsizing her G-cup breast implants. (credit: David Becker/Getty Images)
Mickey Rourke, September 16, 1952
Very few expected Rourke's resurgence, but he continued his acting comeback this year with roles in Iron Man 2 and The Expendables. He’s turning 58. (credit: GABRIEL BOUYS/AFP/Getty Images)
Lil Wayne, September 27, 1982
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Keanu Reeves, September 2, 1964
The Canadian actor turns 46 this year. Anime fans prepare for his upcoming stint as Spike in the live action version of Cowboy Bebop. (credit: MARK RALSTON/AFP/Getty Images)
Jimmy Fallon, September 19, 1974
Funnyman Fallon killed at the 62nd Annual Primetime Emmy Awards last month. He’s turning 36.
Hilary Duff, Septemver 28, 1987
She’s a newlywed! Actress and singer Duff married Canadian Hockey player Mike Comrie in August. Duff turns 23 this month. (credit: E. Rodriguez/Getty Images)
Jeremy Irons, September 19, 1948
Irons fans rejoice: the soon-to-be 62 year old actor will soon star in Showtime’s The Borgias. (credit: Jason Merritt/Getty Images)
Kim Yu-Na, September 5, 1990
Yu-Na is still basking in the glory of her gold medal win at the Vancouver Olympics. The waifish figure skater turns 20 this month. (credit: Jemal Countess/Getty Images for Time Inc)
Jada Pinkett Smith, September 18, 1971
Will Smith’s multi-talented other half turns 39 this month. (credit: BORIS HORVAT/AFP/Getty Images)
Hugh Grant, September 9, 1960
The English charmer and consummate romantic comedy star celebrates the big 5-0. (credit: attermole/Getty Images for Laureus)
Marc Anthony, September 16, 1968
Family life with wife Jennifer Lopez has kept latin singer Marc Anthony busy. He turns 42 this month. (credit: Gustavo Caballero/Getty Images)
Heather Locklear, September 25, 1961
Locklear, who lives in Westwood, California, turns 49. (credit: Frazer Harrison/Getty Images)
Harry Connick Jr., September 11, 1967
Buzz abounds about this singer and actor joining the judge panel on American Idol. He turns 42 this month. (credit: Andrew H. Walker/Getty Images)
Gloria Estefan, September 1, 1957
The Cuban-American singer has won seven Grammy Awards. This year she turns 53. (credit: Ethan Miller/Getty Images)
Fran Drescher, September 30, 1957
The actress, comedian and cancer activist will celebrate her 53rd year of life at the end of the month. (credit: Frederick M. Brown/Getty Images)
Faith Hill, September 21, 1967
Country singer Faith Hill has sold more than 40 million records. The flaxen haired country star turns 43 this month. (credit: Jason Merritt/Getty Images)
Evan Rachel Wood, September 7, 1987
Wood made a splash with her fans with her recurring role in HBO’s True Blood. She turns 23 this month. (credit: Jason Kempin/Getty Images)
Dr. Phil McGraw
(credit: Frederick M. Brown/Getty Images)
Dr. Drew Pinksy, September 4, 1958
Dr. Drew is responsible for detoxing such stars as Janice Dickinson and Dennis Rodman. The USC-alum also turns 52 this month. (credit: Astrid Stawiarz/Getty Images)
Charlie Sheen Through The Years
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Bruce Springsteen, September 23, 1949
He's “The Boss,” of heartland rock, Springsteen turns 61. (credit: Bobby Bank/Getty Images)
Bill Murray, September 21, 1950
Murray celebrates six decades of comedy this month.(credit: Frazer Harrison/Getty Images)
Barbara Walters, September 25, 1929
She's still got it!The soon to be 81 year old underwent open heart surgery earlier this year. She is reportedly well on her way to a complete recovery. (credit: Michael Loccisano/Getty Images)
Avril Lavigne, September 27, 1984
Much has been made about Canadian singer Lavigne dating The Hills star Brody Jenner. She turns 26 this month. (credit: Toby Canham/Getty Images)
Alexis Bledel, September 16, 1981
The actress and model is turning 28, but to many of her fans she’ll always be known as Rory Gilmore. (credit: Neilson Barnard/Getty Images)