Britney hit up Phil Maloof's VIP birthday party at Drai's Hollywood Saturday night, according to Eonline.com.
"Britney arrived around 9 p.m. with a handsome, dark-haired guy who was NOT her on-again-off-again boyfriend and former agent Jason Trawick. She spent most of the time on a couch chatting with Maloof, a longtime friend and part owner of Palms Casino in Vegas."
The man may have been a bodyguard.
"She stayed for about an hour and had fun," says a party source, who didn't witness anything romantic between Britney and her mystery male. "She didn't mention Jason."
Father Jamie joined the party as well, but arrived separately.
Black Star Beer sponsored the party, but sources inside say Britney didn't have any.
"She was mellow but in a good mood," says a source. "She never would drink in front of her dad."