Jessica Simpson has split from Tony Romo, sources have claimed. The 'With You' singer and the American football star have reportedly ended their romance after Tony was overheard telling friends he is single again. A source said: "They're over. Tony told pals he's back on the singles market." When Dallas Cowboys star Tony was questioned about the split, he fumed: "I'm not talking about Jessica." Jessica's dad, Joe Simpson, refused to confirm the split, saying: "I don't know anything about Tony and Jessica." Although a representative for the couple denied they had broken up, sources insist they are no longer together. At the weekend, Tony partied at Chicago club Manor and was surrounded by a string of beautiful women. Yesterday (15.05.08), it was reported Jessica went on a drinking binge after discovering ex-boyfriend John Mayer is dating Jennifer Aniston. The blonde beauty, her best friend Cacee Cobb and Cacee's boyfriend Donald Faison reportedly spent four hours drinking at California's Mexicali Cocina Cantina restaurant, according to internet gossip blogger Perez Hilton. At the end of the session, Jessica was said to be so drunk she had to call her mother Tina to pick her up and drive her home.