It all started innocently enough, according to Star magazine, with a trip to Lake Tahoe, California. The couple checked in to the Squaw Valley resort just days before Christmas, but sources said Sean didn't request couple-friendly accommodations.

"Sean didn't spend much time with his wife—he booked her a separate suite—and when Robin got fed up with being alone, she went over to his suite," an insider revealed. There, she "found him drunk with two Russian girls!"

Allegedly the actor continued to party the night away, while Robin was nowhere to be seen.

"When asked where his wife was, he answered, 'Who cares?'"