Beyonce transforms into Sasha onstage

Beyonce Knowles says she becomes someone else when she's onstage, an alter ego she's even given a name to: Sasha. "I wouldn't like Sasha if I met her offstage," the 25-year-old singer-actress tells Parade magazine in its Dec. 17 issue. "Oh, no. She's too aggressive, too strong, too sassy, too sexy! I'm not her in real life at all. I'm not flirtatious and super-confident and fearless like her. I created my stage persona to protect myself," she says, "so that when I go home, I don't have to think about what it is I do. Sasha isn't me. The people around me know who I really am." One of those close confidantes is her boyfriend, music mogul Jay-Z. "When I'm in love, I'm there 100 percent," she says. "But if I don't trust someone, if I'm not totally there because of it, then I'm not going to waste my time." Knowles, who started out in the girl group Destiny's Child, plays singer Deena Jones opposite Jamie Foxx, Eddie Murphy and Jennifer Hudson in the movie musical "Dreamgirls," opening Friday.