Barbara Walters Exclusive: Peter Cook on Affair

In his first interview since his bitter public divorce from former supermodel Christie Brinkley this summer, Peter Cook told Barbara Walters that "I felt like I was a guest in someone else's life." Many were shocked when Cook and Brinkley split, after 10 years of what from the outside looked like a perfect marriage. Their divorce proceedings this summer were some of the ugliest in recent memory. Cook spoke to Walters about what went wrong, his affair with a teenager and the $300,000 payout...Full Story