CARMEN IS ENGAGED....

Carmen Electra is engaged to her boyfriend, guitarist Rob Patterson, a source tells PEOPLE exclusively.

"He told friends three days ago that he got engaged," says the source. "The ring is a black diamond set in white diamonds."

Patterson, 37, who is the former touring guitarist for Korn, popped the question over the weekend while he and Electra were in Las Vegas to celebrate her 36th birthday. The couple have been dating less than a year.

This will be the third marriage for the actress-model, who was previously wed to rocker Dave Navarro and, briefly, to NBA star Dennis Rodman.