Celebrities Who Swear by Spanx

British pop sensation Adele, who won big at the 2012 Grammys, made headlines when she admitted to wearing four pairs of Spanx under her gown at the event. Spanx inventor Sara Blakely said she still can't believe it sometimes when celebrities say they love her product. "It's hard for me to absorb, like, that's a product I created," she told "Nightline." (Eamonn McCormack/WireImage/Getty Images)