In Hollywood, some romances purposely play out on the red carpet; others, however, remain hidden behind closed doors for years on end. From co-stars who fell for each other on set to A-list couples who managed to keep their relationships under wraps for years, these former flames kept fans guessing until a candid interview, a memoir, or a long-awaited public appearance finally revealed the truth.
So, from Cher to Britney Spears and Nicole Kidman, which celebs had some seriously secret romances? Click on to find out.