Jessica Simpson Can't Get Over John Mayer

Jessica Simpson has her panties in a bunch over John Mayer dating Cameron Diaz. Maybe she should start paying more attention to her career rather than her ex-boyfriends. How long did she date him? Just a few months? Jessica, there's plenty of other hot men out there who would love to bang you so move on.... And take some acting lessons.

A source close to the singer tells Us Simpson is "really jealous" that ex John Mayer is seeing Cameron Diaz. "She had her mouth open a mile wide when she found out," says the source. "She just freaked."Simpson, 27, parted ways with Mayer, 29, in May after dating him on and off for seven months, and "she thinks about him all the time," says the source. "She is so not over him."

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