PRINCESS DIANA showed her cheeky side with a boob birthday cake for Prince William when he turned 13.
Her eldest son was mortified by the saucy gift that she presented to him as he became a teenager.
The family’s former chef Darren McGrady explained that he came into work one day only to find the buxom bake.
Speaking to Hello! magazine, he said: “I came into work that morning and went down to the refrigerator, opened the door and I was just confronted with the biggest pair of boobs I’ve ever seen in my life.
“The Princess had ordered a boobs cake for William’s 13th birthday. William just went bright-red.”
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According to the chef, Princess Diana was often playful with her boys.
He said: “The Princess loved embarrassing people in the nicest way, in a fun way, whether it was telling a dirty, risqué joke – which usually got me.”
On one occasion she invited supermodels Cindy Crawford, Naomi Campbell and Christy Turlington to the house and gave 12-year-old Prince William the shock of his life.
Recalling the incident in a documentary, William said: “I was probably a 12 or 13-year-old boy who had posters of them on his wall. And I went bright red and didn’t 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 sort of childish, fun element really came out when she was spending time with us.
“Our mother was a total kid through and through… All I can hear is her laugh in my head. That sort of crazy laugh of where there was just pure happiness shown on her face.
“One of her mottos to me was, ‘You can be as naughty as you want, just don’t get caught.’”
In other royal news, Meghan Markle has been named the most popular royal, beating Kate Middleton and the Queen.
And an HBO cartoon has sparked outrage as as seven-year-old Prince George and Royal Family are mocked in ‘cruel and unfair’ show.
Plus this is how pregnant Zara Tindall paved the way for Meghan Markle by being the first royal to bravely speak about miscarriage.
