This just isn’t Jessica Simpson’s week. First, those pictures appeared of a slightly bigger Jessica singing at a chili cook-off. Then, the endless back-and-forth about what the weight gain means, what does Tony think, is the whole thing terribly sexist, et cetera. As Celebitchy pointed out, very few people would have noticed the weight gain if Jessica had dressed better. Instead, she jammed herself into too-tight clothing that made her look like a packed sausage. But it still doesn’t mean it was a good career move to sing at a chili cook-off.

But now the final blow to Jessica’s self-esteem. Star magazine is reporting that while Jessica was traveling (to a chili cook-off?), Tony Romo threw a huge party at her house and hooked up with some random girl in Jessica’s bed. I buy that Romo threw a party at Jessica’s house while she was away – he seems like that kind of guy. But I’m not sure I buy the cheating part of the story.

While Jessica Simpson was away, Tony Romo certainly did play!

In the Feb. 9 issue of Star — on sale now — we exclusively report that just hours after Jess flew out of Burbank airport on Jan. 16, her boyfriend decided to host a party — at her house! And if that wasn’t bad enough, the hunky quarterback hooked up with a beautiful brunette.

The very night Jessica left town, Tony hit an invitation-only opening of Los Angeles hot-spot My House with a posse that included Laguna Beach’s Stephen Colletti and Entourage star Kevin Connolly. To keep the fun going, he invited a group of revelers “back to my place,” the onlooker tells Star. But when people arrived at the two-story country cottage-style home off Coldwater Canyon in Beverly Hills, it soon became obvious that “his place” belonged to his unsuspecting — and absent — girlfriend, Jessica.

Amid Jessica’s gold albums, the party raged on downstairs. But on the second floor, Tony was enjoying his own private party — with a long haired, olive-skinned cutie.

“Everyone was talking about it downstairs,” dishes the source. “The girls were saying it was so wrong and shady of Tony to cheat on Jessica — especially in her place! I just can’t believe he would hook up with another woman at his own girlfriend’s house.”

For all the details about the cheating scandal — including how it all went down as well as how he was laughing about it with friends — pick up the new Star today.

From Star magazine

Laguna Beach’s Stephen Colletti and Entourage star Kevin Connolly? Not to criticize, but Tony sure hangs out with the C-listers, doesn’t he? And those are exactly the kind of people who will come to a party at an absent girlfriend’s house, drink all of the beer, then complain to Star magazine that you’re hooking up with some girl.

Another reason I don’t believe this – I believe in my heart of hearts that Tony has a thing for blondes. I don’t see a proud Texan like Tony hooking up with a brunette. It would be a slap in the face to The Lone Star State. Still, Jessica should watch her back.

Header image thanks to popbytes.