2) Michael Sheen & Kate Beckinsale

Was it just us or was there just something too brilliant about this couple? After meeting on the set of The Seagull in 1995, the acting couple began an eight year relationship during which they had a now 14 year old daughter, Lily Mo Sheen. Though they split in 2003, the pair have managed to stay friends ever since, and Beckinsale has publically stated credited Sheen with saving her from "a hospital for the criminally insane."

Kate BeckinsaleMichael Sheen
Kate Beckinsale & Michael Sheen Have Stayed Friendly...But That's Not Enough For Us!

Although Sheen never proposed, Kate claims to have felt like they were married, citing "If you keep a library book out long enough, you feel it's yours." Their 2003 split is attributed to Beckinsale falling in love with Underworld director Len Wiseman, who she subsequently married though she has claimed "He's absolutely one of my most favourite people ever," via The Mirror.

Sheen, who can now been seen starring in Masters of Sex alongside Lizzy Caplan, is said to be friendly with both Kate and Len and even attended a memorial service for Kate's father this summer. Life may be short but there's still time to get back together!