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Mayim Bialik, Michael Stone

Mayim Bialik and husband Michael Stone during Opening Night of "Cavalia" - Arrivals at Big Top in Glendale in Glendale, California, United States. (Photo by Gregg DeGuire/WireImage for BWR Public Relations)

2012 Year In Review: Celebrity breakups

It was a sad year for Hollywood romances, and some of the most famous couples in Tinseltown split in 2012, from TomKat to Heidi and Seal. We bring you the top 10 break ups. -- Soraya Roberts