Courtenay Semel caseycourt.jpg

Looks like Courtenay Semel didn't want to be outdone by Lindsay Lohan and Samantha Ronson - she went all sorts of crazy on girlfriend (and Band-Aid heiress) Casey Johnson!

According to a source for the NY Post, Courtenay and Casey got into a violent fight in which Courtenay "beat the crap out of [Casey], and then lit her hair on fire." It was so bad, Casey had to be hospitalized, and her mother, Sale Johnson, reportedly flew to Los Angeles to meet with attorney Robert Shapiro.

Courtenay told the Post, "There was a fight. But this is a major exaggeration. We are speaking. We are friends."

Hmm, really?