Bristol Palin, daughter of Sarah Palin, and the father of her infant, Levi Johnston, have broken up according to People magazine.

The split happened “a few weeks ago,” according to a source close to the couple, but it’s unclear what precipitated it. “It was a mutual thing,” adds the source.

“It kind of just happened,” says the source, referring to the split. “I thought they would stick it out. But I think they can work together to raise Tripp.”

“I’m not sure what caused [them to break up] – it’s common knowledge,” says another source who knows the family.

Bristol gave birth to Tripp Easton Mitchell Johnston back on December 28th of last year.  She is currently taking classes in hopes of finishing her high school education.