The Enquirer reports Hollywood photographer David Keeler is threatening a lawsuit, claiming Christina Aguilera’s bodyguard assaulted him, and then his nose got bloodied when a homeless man smacked him in the face. Seems Christina looked unsteady after a hard night partying at Club Nacional, where her bodyguard escorted her out. Keeler attempted to take a picture of the two, and was stunned when the bodyguard rushed back towards him, spit in his face, and punched him. Keeler then shouted for the club’s doorman to call police when the homeless man charged him and smacked him as well. The bum, Christina, and her bodyguard all took off before the cops arrived.