Brooke, 49, was famous for publicly vowing abstinence during her younger years - an attitude she believes her mother strongly influenced, as she says she was brought up "terrified" of physical contact with boys.
In reality though, she now confesses that she really lost her virginity at 22 years old, despite not getting married (to tennis star Andre Agassi) for another decade.
Brooke met Dean at Princeton University, where they were classmates and she said they were "instantly crazy" about each other.
“He was incredibly and painfully patient with me regarding sex,” Brooke recalls of Dean. It was her reaction afterwards that was rather dramatic though!
“Afterwards I got so overwhelmed that I jumped out of my bed. I actually kind of tumbled off it and started running,” Brooke writes.
“I was buck naked streaking down a hallway and running like I had just stolen someone's wallet. “
“Dean leapt up and ran after me with the comforter in his arms. He hugged me tight and asked me where I was going. I was afraid I was leaving my mother.
“I didn't know where I began and where my mother ended and that meant I didn't know how to fit Dean in.”
While they eventually split, Brooke still remains on good terms with Dean today. She even called ahead to let him know he would be making an appearance in her book, according to People.
"There's nothing sordid about it. He's such a good guy and a sweet human being," she said.