Bristol Palin & Fiance Split

Bristol Palin and her fiance and the father of her baby son, Tripp, Levi Johnston, have broken up, People reported.

The teenage couple, both 18, split "a few weeks ago," a source told People. "It was a mutual thing."

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Another source was unclear, however, about the exact reason for the split between Levi and the daughter of former Vice Presidential hopeful Sarah Palin.

"I'm not sure what caused them [to break up] – it's common knowledge," another source said.

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Levi still visits with baby Tripp and grandfather Keith Johnson told the mag Levi is a "proud father."

Bristol gave birth to baby Tripp in December.

In February, she told FOX News' Greta Van Susteren, she was thrilled to enter motherhood.

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"I like being a mom. I love it," Bristol said. "Just seeing him smile and stuff, it's awesome. It is very challenging but it's so rewarding. He brings so much joy. I don't regret it at all. I just wish it would've happened in 10 years rather than right now."

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