Kellan Lutz happy to bare all for CK...

Kellan Lutz is the new Marky Mark. He is following in the Oscar nominated star's footsteps (from Marky Mark to Mark Wahlberg) by posing as the new body face of Calvin Klein underwear. Lutz said he was "completely at ease" shooting the ads because the new underwear from CK "hold everything in." Of course he is no stranger to modeling, he started off as an Abercrombie + Fitch model (see below). This is the most he's revealed though, "you know I've done other fittings where you have to wear underwear and you're kind of uncomfortable because they look funny or it doesn't fit well. They (CK) made it really easy. The clothes fit great - there wasn't anything that was riding up, so you don't feel uncomfortable posing." He is worried when he thinks of his mother seeing him on billboards across America though, "But now my nude a*s is going to be all over the billboards, we'll see what my mother thinks!"

See the full campaign also featuring Mehcad Brooks from True Blood, tennis star Fernando Verdasco, and Hidetoshi Nakata after the jump...