Crystal Harris left Hugh Hefner brokenhearted last year when she called off their nuptials five days before the big day.
"The wedding is off. Crystal has had a change of heart," Hefner tweeted on June 14, 2011.
But now, after rekindling their romance in June 2012, Harris, 26, and Hefner, 86, are set to tie the knot on New Year's Eve and have officially obtained their marriage license.
Still, Hef must have been devastated when his wife-to-be became a runaway bride.
Here are 12 other celebrities who were left at the altar: