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Ryan Reynolds, Kristen Johnston

"Third Rock From the Sun" star Kristen Johnston hit the "Green Mile" red carpet in 1999 with a relatively unknown beau nine years her junior: Ryan Reynolds. By the next year, the two went their separate ways -- and he went on to become a huge superstar, not to mention the sexiest man alive. Ryan has changed course, however, and has been going for younger women lately, including ex-wife Scarlett Johansson and Blake Lively.

Who Knew They Dated?!

Courtney Love and Ed Norton? Tom Cruise and Sofia Vergara? Take a look back at some famous couples you might not remember. - By Kathleen Perricone and Lizbeth Scordo, omg!