David Letterman's sensational sex scandal has triggered a $300 million divorce war between the 62-year-old talk-show host and his outraged wife Regina, say sources close to the star. The couple - who lived together for years before marrying March 19 - are fighting over everything from his extensive property holdings to custody of their son Harry, 6, according to insiders. "It's become a real battle," revealed a Late Show insider. "Regina is humiliated, and she wants to get even with David for his public admission he cheated on her repeatedly during their 23-year relationship." The ENQUIRER was told the kinky...