Celebrity weddings, engagements of 2012

160 of 194: Bristol Palin was engaged to Levi Johnston, 20, in 2008 and gave birth to their son Tripp that December at age 18. Weeks later, Bristol Palin and Johnson called off their engagement. They became engaged again in July 2010 and graced the cover of Us Weekly magazine. Bristol Palin broke off the engagement for a second time that same month. (Photo courtesy of US Weekly)