According to several online reports, Jessica Simpson and Dallas Cowboys quarterback Tony Romo have split up. Tony Romo called it quits with Jessica Simpson the night before her 29th birthday.

“She is heartbroken,” says the source. “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.”

This isn’t the first break-up for the couple, who began dating in 2007.

Romo reportedly dumped Simpson last May, but was able to patch things up in time to attend sister Ashlee Simpson’s wedding a few days later.

The first source added that Simpson canceled her birthday party because of the split, but is doing “OK.”

In the wake of the split, Simpson has been hitting up her Twitter account, relaying news that she canceled her birthday party but revealing little else that would seem to suggest a split. “Barbie party didn’t happen, but I turned 29 and feel like I am on top of the world yelling I love getting older.”

She later tweeted, “The beat of a heart can make you realize the special rhythm of a person … just listen. I like the irregular beat; it send me to another place … Everyone needs to know that hope floats … grab the strings and pull it back to you.”