Jessica Simpson is Jealous of Ex's New Love

"She had her mouth open a mile wide when she found out,” says the source. “She just freaked.” John dumped Jess in May, after a seven-month fling, and Jessica is still reeling. "She thinks about him all the time,” the spy said. “She is so not over him.”

And Jessica might be waiting a while if she's thinkiing about swooping back in when John and Cam to break up. The new couple "looked very cozy" -- just last week -- at a club in NYC.

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