Top 20 Strangest Celebrity Couples

6. Mary-Kate Olsen and Olivier Sarkozy

With 17 years between them, this is definitely one of the biggest age-gap relationships in the bunch. No one expected the relationship to last long, but low and behold, the couple got engaged. They still seem to be very happy together, and there are even plenty of rumors going around that they were secretly wed. They have neither confirmed nor denied the rumors, and they continue to act as though they are only engaged.