Kathie Lee Gifford and Hoda Kotb are kicking off the New Year's Eve celebration with "A Toast to 2015!" - the ultimate year-end look at the buzziest stories and events over the last twelve months. An all-star cast of celebrities recount the most talked about moments and mishaps that made for an unforgettable year. Produced by Dateline, the two-hour primetime special airs Thursday, December 31 at 8pm/7c.Dec. 15, 2015