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AnnaLynne McCord, Kellan Lutz

Hector Vallenilla, PacificCoastNews.com

Somewhere, we're absolutely certain, tween heads are exploding (or not, since this isn't about Robert Pattinson) because Twilight stud Kellen Lutz and 90210's AnnaLynne McCord took things to the next level by stepping out in public together in Miami over the holidays.

McCord, who was dressed in a figure-flattering strapless minidress, danced the night away over at Shore Club with her new BF. Only problem is Kellen might not have been up to speed on their dating status 'cause he was sucking on someone else's neck shortly after midnight, blabbed a partygoer. So is K.L. really that kind of guy? We had to inquire with a former Lutz girlfriend to find out.

"I really don't think so...at least, that I know of," dished a gal who, until quite recently, would nuzzle up to Kellen's neck (and other erogenous zones). The Lutz ex claimed exclusively to the A.T. that cheating wasn't "really" Lutz's M.O.

We'd at least like to agree Kel wouldn't be dumb enough to hook up with someone right in front of his girl o' the moment, right? I mean, it's not like he's Doug Reinhardt or anything.

Both K 'n' A are too good-looking to get serious right now anyway, that's what we say. But, like, when the ef do folks with hormones the size of Amanda Byne's stupidity level do the right thing? So please, babes, play that tonsil hockey field a bit more!

Additional reporting by Taryn Ryder and Martin Haro