One day, six-year-old Mara Wilson, who happened to be filming 1993's Mrs. Doubtfire with Robin Williams, learned about sex from her mother. In her upcoming book Where Am I Now? True Stories of Girlhood and Accidental Fame, Wilson detailed the excitement that such grown-up knowledge filled her with, then the ensuing embarrassment when she couldn't contain her youthful joy​. People got a sneak peak at this memorable scene from the book, which is coming out September 13. 

Now do you know who Mara Wilson is?
Advertising

"I wasn't focusing on the scene. I was bubbling with excitement, because I knew this thing, this big open secret, and I could not keep it in any longer," Wilson writes, about what she did after learning what sex was. Upon getting to set the next day, Wilson asked her hairdresser if she'd "done it." Then the young actress shared a new song with the crew: "As soon as she walked away I announced in a singsong voice, I KNOW ABOUT SE-EX! I KNOW ABOUT SE-EX!'" Wilson details.

Advertising