It was supposed to be Alicia Keys' 27th birthday party, but Kimora Lee Simmons took center stage when she got into a bizarre screaming fight with another woman Wednesday night.

The intimate fete at Bed started out mellow enough, with Keys hanging out with her boyfriend, Kerry (Krucial) Brothers, and pals like Clive Davis, Missy Elliott and Common. But minutes after everyone had sung "Happy Birthday," a shrill voice shattered the vibe.

"Get out of my face, b-!" shrieked Kimora, according to a witness.

Guests wheeled around to find the designing wife of rap mogul Russell Simmons yelling at a woman in jeans and a tan vest. "Kimora said that the woman had thrown a drink at her," says one attendee. "She didn't look wet to me. But security grabbed the girl and ushered her out."

Asked by another guest what the fight was about, the woman said, "She's jealous of me!"

The woman couldn't be reached yesterday. Kimora's rep described her as "a disrespectful fan" who "accosted" Simmons. One source added, "Kimora doesn't even know this person, but [the woman] constantly shows up at events where Kimora is expected. Frankly, it's a little scary. Kimora is looking into getting a restraining order."

Whatever the back story, Keys didn't seem to appreciate the drama. "When Kimora was leaving, Alicia totally ignored her," claimed a source. Keys' rep insisted, "She had a wonderful time."

Labels: Alicia Keys, Kimora Lee Simmons