The 39-year-old star, who is married to Stephen Belafonte, said she was happy in a relationship with a woman when she was 17, reported Mirror.
"At 17 you want to experiment. I don't think you should put a name on it. Well actually, I don't care if people put a name on it. I didn't. I had fun!," she said.
The 'X Factor' judge revealed she is still in touch with her former lover with whom she had a sexual relationship as a teen but now she is not interested.