Palin and Johnston break up again

LOS ANGELES, July 30 (UPI) -- Bristol Palin, the daughter of former U.S. vice presidential nominee Sarah Palin, and her fiance, Levi Johnston, have split a second time, sources told E! News.

The sources said the breakup followed a fight between the Alaska natives over one of Johnston's ex-girlfriends, E! News reported.

The younger Palin, 19, and Johnston, 20, are the parents of a 19-month-old son named Tripp.

Neither Palin nor Johnston has publicly commented on the latest split, E! News said.