Princess Diana once surprised Prince William by inviting three supermodels over for tea.
The British royal, now 35, recalls coming home from school one day and seeing Cindy Crawford, Christy Turlington and Naomi Campbell all waiting for him at the top of the stairs.
In ITV documentary Diana, Our Mother: Her Life and Legacy, he recalled: "She organised when I came home from school to have Cindy Crawford, Christy Turlington and Naomi Campbell waiting at the top of the stairs, I was probably a 12 or 13-year-old boy who had posters of them on his wall.
"I went bright red, and didn't know quite what to say and sort of fumbled and I think pretty much fell down the stairs on the way up. I was completely and utterly awestruck. That was a very funny memory that's lived with me forever."
It comes after Prince William admits he regrets his last phone call with his late mother, who died in August 1997.
He admitted: "At the time Harry and I were running around minding our own business, you know, playing with our cousins and having a very good time ... I think Harry and I were just in a desperate rush to say goodbye, you know, see you later and we're going to go off. If I'd known now obviously what was going to happen, I wouldn't have been so blasé about it and everything else. But that phone call sticks in my mind quite, quite heavily."
And his brother Prince Harry admits to feeling the same, adding: "As a kid I never enjoyed speaking to my parents on the phone. And we spent far too much time speaking on the phone rather than speaking to each other, because of the way the situation was. And the phone rang and off he [William] went to go and speak to her sort of for five minutes. I can't really necessarily remember what I said, but all I do remember is probably, you know, regretting for the rest of my life how short the phone call was."