If recent history has taught us anything, it's that celebrity relationships are, sadly, not the most steadfast of human pairings. Not to say that all celeb couples fail, but plenty do. Still, speaking for the hopeless romantic in all of us, when a long-lasting celeb couple ends what seemed to be a happy marriage, it's an even bigger bummer.

Case in point: the recent dissolution of Eva Longoria and Tony Parker's marriage — which got us thinking about other celeb splits that hit us especially hard:

Courteney Cox and David Arquette
The couple, who were married for 11 years, announced their split last month. After the story broke, Arquette called in to Howard Stern's satellite-radio show and aired some dirty laundry, for which he later apologized. The couple reportedly plan to maintain a "business" relationship.

Christina Aguilera and Jordan Bratman
Shortly after Arquette's call to Howard Stern — within the same week — Christina Aguilera issued a statement to confirm her separation from her husband of five years, Jordan Bratman. "Although Jordan and I are separated, our commitment to our son Max remains as strong as ever," Aguilera said.

Kate Winslet and Sam Mendes
Although they claimed their split was "amicable," the announcement of Kate Winslet and Sam Mendes' breakup earlier this year was a surprise that sent the rumor mill a-turning with gossip. Mendes and Winslet have kept quiet about the reasons behind the split. They were married six years and have a son together.

Susan Sarandon and Tim Robbins
After 23 years together, Susan Sarandon and Tim Robbins, who have two grown sons together, announced the end of their relationship last December. Sarandon told Britain's Telegraph that the relationship had run its course. "You bring people into your life at certain times," she said. "Maybe you have a relationship to have children, and you realize that it's fulfilled after that point."

Reese Witherspoon and Ryan Phillippe
This one goes back a ways, to 2006, but when we think of surprise splits, the news of Reese Witherspoon and Ryan Philippe ending their seemingly fairytale relationship is still a bummer. The couple, who met on Witherspoon's 21st birthday, were married for seven years and have two children together.

Who did we miss? Which couple's breakup surprised you the most? Share your most shocking celeb spits in the comments.