"You never know what happens. Life changes" - Heidi Klum

"What doesn't kill you makes you stronger" - Jennifer Aniston

"I was a child, really, when I got married. And I needed to grow up" - Nicole Kidman

"Dennis was not faithful to me for a very long time, and that was very painful" - Meg Ryan

It's always sad when a relationship breaks down, but some celebrity divorces have surprised us more than others. Reese Witherspoon's marriage to Ryan Phillippe appeared rock solid up until they announced their separation in 2006 and Jennifer Lopez's marriage to Marc Anthony seemed destined for the long run.

The world heaved a collective sigh of dismay when Jennifer Aniston and Brad Pitt called it quits four years after tying the knot in a fairy tale Malibu wedding and Heidi Klum's split from Seal came as a shock after so many years spent smooching in public at their many Halloween parties.

With news today that Gwyneth Paltrow is separating from her husband of ten years Chris Martin, we take a look back at other high-profile couples who didn't make the distance - and why their marriages fell apart. From the "third person" in Charles and Diana's marriage to Elizabeth Taylor's explosive rows with Richard Burton and time spent apart for Nicole Kidman and Tom Cruise, here are history's most memorable and heartbreaking divorces:

Jennifer Aniston and Brad Pitt (2000 - 2005)

Reason for divorce: "It is not the result of any tabloid speculation"

Hollywood's most heartbreaking divorces