It looks as if Jessica Simpson still can't get over John Mayer trading her in for Jennifer Aniston. Although the Diva is still fauning over her recently departed EX, Tony Romo, Jessica still seems to be bitter over being dumped by Mayer. Entertainmentwise reports that Jessica is warning Jennifer that he will do the same thing to her. Could I see a  bit of Jealousy here?

"Jessica Simpson is trying to warn Jennifer Aniston be careful with new man John Mayer, because he is a notorious "ladies man".

The wannabe country singer, who is currently dating American football star Tony Romo, was said to be jealous that her ex-boyfriend Mayer is dating the Friends star, but sources claim the green-eyed monster people are seeing is actually just concern.

A source says via Transworld News: "Jessica wants Jen to be aware of what she's letting herself get into with John. She doesn't want her to make the same mistakes. John is a ladies man."

Others are also letting the rocker's true colours be known, with a friend of Mayer adding: "He'll spend every waking minute talking to someone and spending time with them and then move on to the next girl," said the friend"

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