#4 Mario Lopez & Ali Landry – 18 Days

After six years of dating, Mario Lopez and Ali Landry tied the knot in a beautiful ceremony in Mexico in April 2004. Everything seemed picture-perfect—until it wasn’t.
Two weeks later, Landry discovered Lopez had cheated during his bachelor party. Lopez later admitted in his memoir that he realized he wasn’t in love. The marriage was annulled, leaving Landry heartbroken and the public stunned.