06/08/2012 02:53 pm ET

Celebrity May-December Romances: Stars Who Date Younger And Older (PHOTOS)

Having a much younger or much older significant other has become somewhat of a Hollywood tradition. From older actors reliving their youth with much younger ladies to cougars on the prowl for a boytoy, it seems age really is just a number for many stars.

The latest May-December romance that caught many people by surprise is between Mary-Kate Olsen, 25, and Frenchman Olivier Sarkozy, 42, (brother to former French president Nicolas Sarkozy).

"MK is constantly complaining about boys not being mature enough for her," a source told Us Weekly, confirming rumors that the pair is dating. "She got the kids out of her system. Now being a businesswoman dominates her time, and she is rarely impressed with guys."

Though their 17-year age difference is, well, quite large, the Olsen and Sarkozy's romance isn't the most shocking. Hollywood legend Dick Van Dyke, 86, married a woman 46 years his junior in 2012, while Hugh Hefner's girlfriend (and former fiancee) Crystal Harris is 60 years younger than him.

Check out some other celebrity romances with some major age differences below:

Celebrity May-December Romances