Jessica Simpson’s Large Mouth Betrays Her Jealousy Over Cameron and John

While John Mayer is busy going green, Us Magazine is reporting that his ex, Jessica Simpson, is busy being green…with envy.

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.”

And the way they could tell this was her mouth being open a mile wide? Have they seen Jessica Simpson before? Her mouth could fit a freight train twice on Tuesday and she shows us that in every photo she takes.

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.”

Meanwhile, Simpson seems to be a distant memory for Mayer, who has continued his summer romance with Diaz, 35, in NYC. Though they spent August 22 and 23 apart (he hit the gym and recorded at a studio; she shopped and then lunched at Mary’s Fish Camp), they finally squeezed in quality time in the wee hours of August 24 at hot spot Socialista. The pair — who left at 4 a.m. through different exits — “were very cozy,” says a witness.

But what, pray tell, of the rumored romance between Cameron and Bradley Cooper? E! reports:

Sources close to Bradley and Cameron Diaz tell me that the two have been dating the past couple weeks. Pretty adorable, no?

Bradley’s rep insists that it is "not true" that the two are dating. However, insiders tell me that Cameron and Bradley have been busy sending flirty text messages to each other throughout the day and spending quite a bit of time together.

I can only guess that Cameron must be good in the sack cuz that face could be most people’s butt double.