Kellan Lutz showed off his famously impressive muscles heading out of the gym in LA yesterday. He kept his abs covered up, but we got quite an eyeful of that six-pack with the official Calvin Klein underwear commercial and this behind-the-scenes video of Kellan in next to nothing. Underneath those rock hard pecs is a heart of gold, as Kellan showed once again running for charity in Puerto Rico with AnnaLynne McCord over the weekend.

More photos of Kellan showing off his guns and video of his shirtless CK shoot so read more.

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A sexy Calvin Klein video of Kellan Lutz showing off lots of skin was just released. The almost NSFW video is after the jump, where you can see his X-rated messages. While he's barely dressed in those, he was fully clothed with AnnaLynne McCord as the two headed out of town from LAX on Friday. The couple flew from NYC to LA a few weeks ago, and this time they were off for a weekend in San Juan, Puerto Rico. All of Kellan's running and exercise prepared him and AnnaLynne, who both took part in the first annual Roselyn Sanchez Triathlon For Life Race on Sunday. AnnaLynne was recently shy about her relationship status with Kellan, but their latest trip and romantic dinner together suggest they're going strong.

To see the sexy NSFW video and more photos of Kellan and AnnaLynne traveling together, just read more.

Kellan Lutz had his two favorite companions, Kevin and Kola, along for a jog in LA this morning. He was hard at work maintaining the impressive physique that's earned him a CK underwear campaign and the admiration of Robert Pattinson, though you guys think Rob's just fine the way he is. There's evidently someone who's more than content with Kellan at the moment as well - he was spotted sharing a cozy dinner with rumored girlfriend AnnaLynne McCord earlier this week.

To see more photos of Kellan, Kevin, and Kola, just read more.

Kellan Lutz was just in NYC for Cosmo's Fun Fearless Males party, and while on the red carpet he opened up about his legendary exercise routine. He's already found a fan in Peter Facinelli and, apparently, also Robert Pattinson. Kellan said, "He asks me what I do to work out because he wants man-boobs like me. I just tell him I like doing pushups." We've see Rob's fine form before, but evidently he thinks there's room for improvement. So, tell us what you think - would you like to see Robert with Kellan's body?