ITS safe to say Jessica Simpson is not having the best week ever. She's hasn't even had a chance to swallow the bad press she's been getting for her recent weight gain, and now she has to deal with infidelity reports. Star magazine is reporting that Jess' quarterback beau Tony Romo cheated on her while she was away"at her own house The magazine is claiming that hours after Jessica boarded a flight on January 16, Tony went to LA hotspot My House with Laguna Beach's Stephen Colletti and Entourage star Kevin Connolly. After the party he invited guests "back to my place," to keep the party going. While guests mingled downstairs, Tony was enjoying his own private party - "with a longhaired, olive-skinned cutie" upstairs. "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." The story is a little hard to swallow. Jess and Tony seem like such a happy couple, but it must be true when they say there's always trouble in paradise. - HS