Who'd You Rather?

So-called funnyman Carlos Mencia turns 40 on Monday, while geek chic movie star Jeff Goldblum turns 55.

"Office" funnyman John Krasinski turns 28 today, and "Lord of the Rings" star Viggo Mortensen turns 49.

"Extreme Makeover: Home Edition" hottie Ty Pennington turns 43 on Friday, while "SNL" alum Chris Kattan is 37.

Somber action star Jean-Claude Van Damme turns 47 on Thursday, while dreamy teen idol Zac Efron turns 20.

Two of the biggest names in hip-hop are celebrating their 35th birthdays on Wednesday: Wyclef Jean and Eminem.

Oscar winner Tim Robbins turns 49 on Tuesday, while Grammy winner John Mayer turns the big 3-0.

"Las Vegas" star Vanessa Marcil turns 39 on Monday, while R&B singer Keyshia Cole turns 26.

R&B star Usher Raymond turns 29 on Sunday, while "Borat" funnyman Sacha Baron Cohen is 36 on Saturday.

"X-Men" hunk Hugh Jackman is celebrating his 39th birthday on Friday, while "Growing Pains" child star turned televangelist Kirk Cameron is 37.

"90210" hottie Luke Perry turns 41 on Thursday, while Jewel's longtime boyfriend Ty Murray turns 38.

R&B songstress Mya is 29 on October 10, while dance queen Bai Ling turns 37.

He may not be able to leap tall buildings in a single bound, but "Home Improvement" big bro Zachery Ty Bryan (26) does share a birthday with "Superman" star Brandon Routh (28).

"Bourne Ultimatum" star Matt Damon turns 37 today, while actor/musician Nick Cannon turns 27.

"American Idol" judge Simon Cowell turns 48 on Sunday, while "Idol" champ Taylor Hicks turns 31.

"Titanic" star and multiple Oscar nominee Kate Winslet is 32 today, and heiress/"designer" Nicky Hilton is 24.

Teen movie queens Rachael Leigh Cook (28) and Alicia Silverstone (31) share a birthday today.