Mario Lopez Turns 39: See the 'X Factor' Co-Host's Sexiest Shirtless Moments (VIDEO & PHOTOS)

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A.C. Slater is turning 39 -- and looking fine.

Mario Lopez -- who's celebrating his birthday Wednesday -- has become almost as famous for his buff bod as his wide-ranging career.

The newly announced X Factor co-host even went as so far as to use his toned bod to promote his underwear line, Rated M. Aside from posing topless in gold body paint and then again in a series of black and white promo snapshots, Lopez even stripped down to his skivvies during an episode of Ellen DeGeneres' talk show to promote his fashion collection.

But he's not all about adding to his rock-hard abs.

Lopez wants to expand his family too.

“I want more kids,” he told Celebuzz exclusively this May. “It’s the best thing in the world. “I can’t wait for more.” Lopez welcomed daughter Gia with fiancee Courtney Mazza in September 2010.

 

To celebrate the star's 39th birthday, Celebuzz is taking a look back at his sexiest shirtless moments. Click through our gallery and help us wish Mario a very happy birthday!

 

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