The ultimate betrayal! Check out the biggest celebrity cheating bombshells through the years -- including scandals involving Kristen Stewart, Tiger Woods, Katharine McPhee and Ashton Kutcher.
Jude Law and Sienna Miller split when it was revealed that Law cheated on the actress with his children's nanny, Daisy Wright, in February 2006. The two briefly rekindled their romance after splitting, but eventually called it quits for the last time in February 2011. "That was a very pivotal time in my life, and I'm happy saying that," Miller told Vogue in July 2009. "It's a private moment when you get your heart broken for the first time."
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