In 25 years of The Oprah Winfrey Show, only one celebrity will go down in history as having the most guest appearances on the show. That distinction goes to music superstar Celine Dion, who's been part of a whopping 27 shows since her very first appearance in 1996. Though her voice made her an international superstar, it's Celine's charm that 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 into the world—and surprised adoring fans on screen. She's also had plenty of memorable moments with Oprah herself, like singing to her on her 50th birthday and teaching her to fly in Las Vegas. (thetvdb.com)