Jessica Simpson and her cowboy Tony Romo have parted ways, which means they're both single and on the market again!

Jessica and Tony, who have been together for some time now, split up one day before Jessica's 29th birthday ... how sad!
Both Jess and Tony's reps had no comments on this.

It was expected that Jessica was going to throw a huge Barbie & Kent b-day bash, but that obviously didn't happen. That day, Jess tweeted on her Twitter account and said: "Barbie party didn't happen, but I turned 29 and feel like I am on top of the world yelling I LOVE GETTING OLDER!"
Later that night she also tweeted: "Everyone needs to know that hope floats ... grab the strings and pull it back to you." Three hours later, she wrote, "Falling asleep with my mom and the dogs. Please lord give all of my beautiful fans, friends, enemies, and family rest. Bring all of us peace."

Why did those two break up? Is it their busy schedules? Celebs usually blame work for their failed relationships ... but it could be true.