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Ashlee Simpson, Vincent Piazza

LOS ANGELES, CA - SEPTEMBER 23: Actors Ashlee Simpson and Vincent Piazza arrive at HBO's Official After Party at The Plaza at the Pacific Design Center on September 23, 2012 in Los Angeles, California. (Photo by Jason Merritt/WireImage)

2012's Celebrity Breakups

Heidi Klum and Seal, Tom Cruise and Katie Holmes, and many more called it quits this year.