Bristol Palin and Levi Johnston call off engagement

Bristol Palin and Levi Johnston have called off their second engagement after he told her he may have fathered a baby with another woman.

Palin declined to identify the woman to People magazine, but a pregnant ex-girlfriend of Johnston has publicly denied he is the father.

Palin, the 19-year-old daughter of former Alaska Governor Sarah Palin, said Johnston told her about the baby on July 14, the day the couple announced their re-engagement. Bristol Palin and the 20-year-old Johnston have a toddler son together, Tripp.

Representatives for Palin and Johnston did not immediately return requests for comment on Tuesday.

Palin had said she didn't have her mother's full support over reconnecting with Johnston. She said both her mother and father worried she would get hurt again.

Palin said the "final straw" was when Johnston told her he was going to Hollywood to see a hunting show, but actually went there to star in a music video mocking her family. In the video being shot this month in Los Angeles, Johnston will play a lover whose romance is thwarted by his girlfriend's disapproving mother. The project is based on the song After Love by singer-songwriter Brittani Senser.