1. Celine Dion
Only one celebrity will go down in history as having the most appearances on the show—music superstar Celine Dion! She's been part of a whopping 27 shows since 1996.

Look back at Celine's 27 appearances

Though her voice made her an international superstar, Celine's charm won viewers' hearts. In the past 15 years, Celine has shared some of her most intimate moments—from falling in love with husband René to bringing her first child and miracle twins into the world—and she's surprised adoring fans. In February 2011, Celine stopped by Oprah's studio one last time to say au revoir.