'Twilight' star Kellan Lutz had to don a black wig and hide under a hoodie in South Beach to avoid fans.The actor, who's been dating "90210" beauty AnnaLynne McCord, attended a Phish concert recently.And then he tried to go incognito while partying for hours at the Delano's Florida Room.But his plan to hide didn't really work."The disguise didn't really work. He was getting lots of admiring glances from women, but he only seemed interested in hanging with his friends," the New York Post quoted a spy as saying.