AceShowbiz -

It's tragic. Carmen Electra and her rocker fiance Rob Patterson reportedly are on the rocks already, less than a month after they made public their engagement. The actress, who rose to fame as a Playboy model and "Baywatch" star, is upset over the engagement ring, which is not so expensive, it has been claimed.

Rob proposed to Carmen last month when they were celebrating her 36th birthday. The Korn guitarist gave her a huge black diamond ring which she was seen wearing on her engagement ring days later after the engagement report first surfaced on the net.

"She seems really embarrassed. I think the ring is a real deal breaker. She thought she'd be getting this giant rock. Instead, Rob bought it online for a bargain price!" a source told Life& Style. "Rob doesn't have a lot of money coming in and he's been driving around in Carmen's car while she's working. He's a total freeloader. Carmen's starting to realize that Rob may not be able to hold up his end of the bargain."

Carmen and Rob, nevertheless, "aren't breaking up tomorrow. She's shooting the movie Goodie Two Shoes in Louisiana and has lots of appearances lined up, so she and Rob won't be together that much. The less time they spend together, the longer the relationship will drag on, but it won't last. She'll come to her senses," the source went on saying.

The report remains unconfirmed though.