Kevin Federline remembers the moment he knew his marriage to Britney Spears was over. Detailing (another) "final straw" of the romance in his new book, You Thought You Knew, out now, the dancer said a phone call with his wife and her pals Paris Hilton and Lindsay Lohan was the beginning of the end. Per TMZ on Monday, the pop star was taking care of the couple's kids, Sean Preston and Jayden James, who were both just babies at the time. Kevin explained: "I was in Miami for work, trying to stay focused on my commitments, and I got a call.