Bobby Brown dated Madonna before he married Whitney Houston.
The singer - who was married to 'I Will Always Love You' singer Whitney from 1992 to 2006 - claims he was intimate with Madonna at the height of his success.
Bobby, who makes the revelations in his autobiography 'Bobby Brown: The Truth, the Whole Truth and Nothing But', writes: "By the time I reached my third single on the 'Don't Be Cruel' album, I was one of the biggest stars in the world. With success comes the women! At this time, I probably had dated half of the industry including Madonna."
"I met Madonna early in my career. She used to open up shows for New Edition in New York at the beginning of her career, so running back into her and getting to know her better at the height of my success was like a reunion. The list goes on from the who's who to the flavor of the month."
Meanwhile, Whitney - who has a 15-year-old daughter Bobbi with the rapper - has hit back at former drug addict Bobby's claims she introduced him to cocaine.
A representative for Whitney said: "Miss Houston is sad that Bobby feels he need to say such things but she chooses to take the high road and will not speak badly about the father of her child even if it's to set the record straight."
'Bobby Brown: The Truth, the Whole Truth and Nothing But' is set to be released in the U.S. later this month.