"It's amazing to be part of such a huge company," he told me Friday. "Calvin Klein...it's always meant sexiness to me. For me, it was always something really cool if I could be on a billboard and now, soon enough, I will be!"
We can't wait to see the larger-than-life-size package picture!
But just because he's stepping into the legendary undies doesn't mean he's the next Mark Wahlberg, who was once the face and body of CK skivvies...
"There's no way I could fill his boxer briefs!" he told me, before adding, "But it's great to be seen on that level."
Kellan did say he that his Twilight costar Taylor Lautner would be no competition at the DirecTV Celebrity Beach Bowl, which they both played in on Saturday.
"I'll use my height and hopefully they'll throw to him and I can intercept it and run it for a touchdown," he said. When asked if he thinks he has more game, he didn't hesitate.
"I definitely do!" he replied. "I played football growing up."
Not to sound cocky or anything...!
See more stars at the big game in our Super Bowl Sightings gallery!