10. Jason Aldean  

Country star Jason Aldean's life turned into a bona fide country tune when news broke that he'd been caught cheating on Jessica Ussery, his wife of 12 years. The adultery scandal broke when Aldean was photographed locking lips with former American Idol contestant Brittany Kerr. The extramarital make-out session took place in a bar, and Aldean later issued a public apology for the indiscretion. {relatedarticles}The move was too little, too late: Aldean and Ussery filed for divorce in April, citing irreconcilable differences.  

These celebrity cheaters are just the tip of the iceberg when it comes to affairs of the heart in Hollywood. And while some of the adulterous antics have been forgiven, they'll likely never be forgotten.