Lonely Hearts Club: 15 Celeb Couples Who Have Broken Up Since 'Last' Valentine's Day

Rachel McAdams Michael Sheen

Michelle Williams Jason Segel

Diane Lane Josh Brolin

Julianne Hough & Ryan Seacrest

Nina Dobrev & Ian Somerhalder

Kristen Stewart Robert Pattinson

George Clooney Stacy Keibler

Jonathan Groff Zachary Quinto

Lily Collins & Jamie Campbell Bower

Monica Bellucci Vincent Cassel

miranda kerr orlando bloom

liam hemsworth miley cyrus

Kris Jenner Bruce Jenner

Khloe Kardashian Lamar Odom

Taye Diggs Idina Menzel

Valentine's Day can be a rough holiday for single people--and celebrities are not exempt. Sure, celebs might be rich, famous, talented and beautiful, but even they have to deal with the sting of loneliness sometimes. All the couples on this list looked totally in love last Valentine's Day, but oh, how times have changed…

We all want to believe love lasts forever, but it didn't for picture perfect married couples like Khloe Kardashian & Lamar Odom, Miranda Kerr & Orlando Bloom and Taye Diggs & Idina Menzel.

Some couples don't just break each others' hearts--they break their fans! The Vampire Diaries fanatics are still hoping that the amicably split Nina Dobrev & Ian Somerhalder will reconnect and some Twi-hards are still in denial that Kristen Stewart & Robert Pattinson are officially over.

Still, some celebrity couples seem doomed to fail from the start, so it's not a surprise that they break up. Rather, it's shocking they stay together for so long. Take George Clooney & Stacy Keibler. Even though Keibler is a gorgeous babe, Clooney's legendary commitment-phobia made the romance destined to end.

For whatever reason, the 15 couples on this list seemed hot and heavy last Valentine's Day, but none of them are going to be each other's Valentine this year.

[Photo Credit: Getty Images]