"Etta girl! Beyoncé is a smash in Cadillac Records," the New York Daily News hailed after last night's NYC premiere of the flick. Beyoncé threw herself into the role of jazz icon Etta James. "I gained 15 pounds; I tried to make a physical as well as emotional transformation," she said in a recent interview. "I don't take it for granted, and I work very hard with my acting coach." Apparently it paid off. "Beyoncé knocked it out of the park," Gabrielle Union said. "She killed it." The movie opens Friday.