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The Cheater: David Boreanaz and Rachel Uchitel (for starters)
The details: A rumor cropped up in the Fall of 2009 that the "Bones" star had an affair with a certain event planner by the name of Rachel Uchitel while he wife Jamie Bergman was pregnant (and confined to bedrest) with the couple's second child. Supposedly, Uchitel broke it off because Boreanaz texted her a blow-by-blow of the birth of his daughter Bardot, which she thought was something he should have kept private. No matter, since the story didn't get much play since Uchitel's other married lover, Tiger Woods, was about to become the sex-scandal-of-the-year.
Then in May of 2010, Boreanaz came clean to People magazine because the woman in question (Uchitel insists it's not her) has retained a lawyer (Gloria Allred) and wants a six-figure payment from the actor.