Cheater: Barry Bonds
Date Of Affair: 1994 - 2003

Kimberly Bell, who allegedly was baseball player Barry Bonds' lover for nine years, has also been a key witness in the Home Run King's steroids trial. They supposedly started seeing each other in 1994 while the controversial MLB star was divorcing his first wife and continued doing so, even after Bonds got married again in 1999. She has testified that she underwent abuse from the slugger after he began using 'roids which made him "increasingly aggressive, irritable, agitated and very impatient."

But, perhaps most damning of all (at least to Bonds' ego) was the claim that his testicles shrunk as a result of 'roiding. The sexy-in-a-mature-manner graphic designer also claims Bonds did buy her a house but ceased making payments on it as he told her he would. No word if that was because of the foul ball comment.