Ashley Greene couldn’t resist the madness of the boozy SantaCon bar crawl. The “Twilight” hottie was spotted wearing a reindeer headband with antlers on Saturday at the Fat Black Pussycat on West Third Street. “Ashley was chatting with one of her girlfriends among the sea of [sloshed] Santas,” a spy said. “She had a cocktail in her hand, but she didn’t appear to be drinking too much.” Our spy added that Greene, who’s dating Reeve Carney, star of “Spider-Man: Turn Off the Dark,” didn’t seem distracted by the hard-drinking white-bearded masses, and “wasn’t talking to any guys, only her friend.” Greene’s rep didn’t respond.