Tony Romo dumps Jessica Simpson

Tony Romo pulled the plug on his relationship with Jessica Simpson on Thursday the night before her 29th birthday."She is heartbroken," a source tells People.

"She loves Tony. But it's been difficult lately. He's busy with his career and she's getting ready to shoot her show (The Price of Beauty). They decided to part ways." She was supposed to celebrate her birthday with a Ken and Barbie-themed party. "She canceled her party because of this," another source tells Us Weekly. "She's doing OK."