CNN's Larry King is splitting from his seventh wife, who says the 76-year-old cheated on her. The talk show anchor and his wife Shawn Southwick, 50, both filed for divorce Wednesday citing "irreconcilable differences." The marriage crumbled after Southwick accused King of having an affair with one of her close relatives, TMZ reported. In December, the National Enquirer reported King cheated on his wife with her younger sister Shannon Engemann, quoting an unnamed friend of Southwick's. The tabloid also said Southwick had an affair with her son's baseball coach in 2008 - a claim she denied. "It's a very...