Bristol Palin Calls It Quits With Fiance
The other girl was not identified, but a pregnant ex-girlfriend of Johnston has publicly denied he is the father.
The 19-year-old daughter of former Alaska Gov. Sarah Palin told People magazine that 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.
Sarah Palin, the 2008 GOP vice presidential nominee, says she hopes her daughter will "move forward in life with her same forgiving, gracious, optimistic spirit, but from henceforth she'll know to trust but verify."