In this magazine cover image released by Us Weekly, Bristol Palin, daughter of 2008 Republican vice-presidential candidate and former Alaska Gov. Sarah Palin, poses with Levi Johnston and their son Tripp on the cover of the July 26, 2010 issue of "Us Weekly" magazine. (AP Photo/Us Weekly)
August 3, 2010 2:00:11 PM PDT
ANCHORAGE, Alaska (AP) - August 3, 2010 --
Bristol Palin and Levi Johnston have called off their second engagement after he told her he may have fathered a baby with another girl.