Were Kirstie Alley and Patrick Swayze really once an item?
In an interview with "Entertainment Tonight" earlier this week, the 61-year-old actress admitted that she and the late actor fell in love on the set of their 1985 TV series, "North and South," while they were both married. Alley was quick to clarify that they "did not have an affair."
"I think what I did was worse," she said. "Because I think when you fall in love with someone when you're married, you jeopardize your own marriage and their marriage. It's doubly bad."
Alley may have shocked fans with her admission, but she's hardly the first celeb to carry on a secret affair. Click through the slideshow below for five more under-the-radar celebrity romances.
In an August 2012 interview with the Guardian, Jean-Claude Van Damme admitted to an affair with popstar Kylie Minogue when the two co-starred in the movie adaptation of the "Street Fighter" video games in 1994. At the time, Van Damme was married to wife Darcy LaPier.
While married to second wife Maria Langham in 1935, Clarke Gable, then 34, had an affair Loretta Young, his 22-year-old co-star in the film "The Call of the Wild." In a posthumous biography, Young admitted publicly that Gable was the father of her daughter, actress Judy Lewis.
In March 2012, UK paper The Sun reported that Jermaine Jackson -- Michael Jackson's older brother -- had an affair with Whitney Houston in the 1980s and carried a torch for her until the day she died. Jackson was married to Hazel Gordy at the time.
According to a 2008 biography, Richard Burton had an extramarital affair with Marilyn Monroe while married to his first wife, Sybil Williams in the late 1950s and early 1960s. The actor would go on to marry Elizabeth Taylor twice.
In her 2008 memoir, Barbara Walters revealed that she'd had an affair with married U.S. senator Edward Brooke for several years during the 1970s.