Pack your bags, because Andy Cohen is ready to take you on a trip down memory lane. The Watch What Happens Live host will helm the three-part limited series, Andy Cohen's Then & Now (Previously known as "Then and Now with Andy Cohen") premiering Sunday, December 13 at 10/9c. The multi-part special will break down key moments of three significant years in history: 1989, 1994, and 2000. In the special, Andy will be joined by newsmakers, writers, and celebrity guests to discuss trends and events that made each of those years unforgettable, including never-before-heard insider stories from those who experienced the moments for themselves. Guests will include Kelly Ripa, Connie Chung, Dr. Drew, Mariel Hemingway, Real Housewives of New York's Bethenny Frankel, and Margaret Cho, as well as former White House Social Secretary Jeremy Bernard.