Kellan Lutz — and a True Blood Star — Strip Down for New Ad!

 Calvin Klein

Hot! Hot! Hot!

Twilight hunk Kellan Lutz is among the hunks stripping down to their skivvies in new ads promoting Calvin Klein's latest male underwear collection, X.

The campaign also features True Blood star Mehcad Brooks, Spanish tennis star Fernando Verdasco and Japanese athlete Hidetoshi Nakata.

According to Women's Wear Daily, the new X campaign promises to be Calvin Klein's most digital to date. It launches March 1, so keep your eyes open for behind-the-scenes videos; interviews with the four hotties and (gasp!) 3D-effect versions of the ads.

"We're thinking bold, graphic and provocative, as always," said Bob Mazzoli, chief creative officer for Calvin Klein Underwear.

See Twilight stars before they were famous!

How did Lutz, 24, get in shape for the ads?

"I swear, candy helps! Gummy bears!" he told at a Calvin Klein cocktail bash Jan. 28 in L.A. "It helps fight the hunger of higher calorie foods, but it is bad for the teeth."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!