The author was out partying in Hollywood with big sister Joan Collins when she caught the eye of the actor.
She recalls, "I was about to be 16. He sent someone over to me to say, 'Marlon thinks you're great-looking and have a great body and would like to meet you.'"
Collins admits she didn't hesitate and jumped into bed with Brando days later.
She tells U.S. tabloid the Globe, "We had a very brief but fabulous affair... He was at the height of his fame and gorgeous."