PRINCE William once returned home from school as a teen to find Naomi Campbell, Christy Turlington and Cindy Crawford outside his room.
The prince made the admission during a candid chat about his mother, Princess Diana, in new documentary: Diana, Our Mother: Her Life and Legacy, which airs on Monday night.
The 35-year-old is joined by younger brother Prince Harry in the programme, as the two Royals open up about their most personal memories of their mother - many of which are embarrassing.
William recalls at one point: "There's a couple of memories I have that are particularly funny.
"Just outside this room where we are now, 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 12 or 13 year old boy who had posters of them on his wall and I went bright red and didn't quite know what to say and sort of fumbled, and I think I pretty much fell down the stairs on the way up.
"I was completely and utterly sort of awestruck.
"But that was a very funny memory that - that's lived with me forever about her loving … and embarrassing and sort of, you know being - being the sort of the joker."
Harry, 32, shared his older brother's sentiment that their mother - who died in a car accident in Paris in August 1997 - was funny and cheeky.
He says: "Our mother was a total kid through and through.
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"When everybody says to me, you know, so she was fun, give us an example…all I can hear is her laugh in my head.
"And that… sort of crazy laugh of where there was just pure happiness shown on her face
One of her mottos to me was, you know, "you can be as naughty as you want, just don't get caught."
"She was one of the naughtiest parents."
While the brother's have many happy memories of their mother, Harry admits it has taken them a long time to be able to speak so personally about her.
He explains: "Arguably, probably a little bit too raw up until this point. It's still raw."
William adds: "There’s not many days that go by that I don’t think of her.
"Her 20th anniversary year feels like a good time to … remember, you know all the good things about her and hopefully provide maybe a different side to her that others haven't seen before."
Diana, Our Mother: Her Life and Legacy airs on ITV at 9pm on Monday, 24 July