TV Characters Who Slept With Their Best Friend’s Guy — or Girl! (PHOTOS)
- 6 of 7
- Autoplay
)
full size
Mark Sloan (Eric Dane) on Grey’s Anatomy
Grey’s Anatomy’s Derek (Patrick Dempsey) and Addison (Kate Walsh) fell in love and married young, but their happy union just wasn’t meant to last. After 11 years of marriage, Addison ended up sleeping with Derek’s best friend, plastic surgeon Mark (Eric Dane). The bright side of this whole awkward scenario? The creation of MerDer, obviously!
