Teen boys aren’t hard to understand. They have silly (and gross) senses of humor leftover from their childhood days and an obsession with girls that’s a precursor to their upcoming adulthood. Immature, yes, but also, easy to embarrass — and Princess Diana apparently knew the best way to tease her son Prince William when he was in this stage of life. The late Princess of Wales reportedly gave her eldest child an “embarrassing” birthday cake that was definitely not up to the usual royal standard.

Darren McGrady, a former chef to the British royal family for 15 years, revealed how cool Princess Diana was as a mom. “When I moved to Princess Diana[‘s home], it was much more relaxed,” he told Heart Bingo, per Marie Claire. Case in point: a boob-shaped birthday cake she gave her son!

Prince William, Kate Middleton

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“I remember one of Prince William’s birthday cakes,” McGrady told the outlet. “I came into work and opened my refrigerator and there was a large box in there. I opened it, wondering who was using my refrigerator, and there was a large pair of women’s boobs.”

The Princess of Wales and Prince William stand and applaud in the Royal Box on Centre Court at Wimbledon, as Steffi Graf wins the Women's Singles Championship.   (Photo by Rebecca Naden - PA Images/PA Images via Getty Images)

The Princess of Wales and Prince William stand and applaud in the Royal Box on Centre Court at Wimbledon, as Steffi Graf wins the Women’s Singles Championship. (Photo by Rebecca Naden – PA Images/PA Images via Getty Images)
Rebecca Naden – PA Images/PA Images via Getty Images

She got her teenager a boob cake?! It’s so unexpected, and yet, so on brand for Diana.

McGrady continued, “It was the cake Diana had bought for William. She’d thought he’d find this funny. She loved embarrassing William, and it was a fantastic gift for him. He loved it, it went down really well.”

We bet it did! She wins the award for the coolest mom ever. But it wasn’t just about getting a funny cake. Princess Diana also did her best to make sure the boys’ birthdays were normal. “For the princess and the boys, birthdays were about spending time together,” McGrady explained. “She made sure that while they had the royal side with all the pomp and pageantry with Charles, they also got the ‘normal’ life with her. That meant a Saturday night treat was sitting in front of the television eating hamburgers and chips. That was a special treat for them.”

This is similar to how Prince William’s wife Kate Middleton treats their kids Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7, on their birthdays. In a previous interview, Middleton shared on the BBC program, A Berry Royal Christmas with Mary Berry, “I love making the cake. It’s become a bit of a tradition that I stay up ‘til midnight with ridiculous amounts of cake mix and icing and I make far too much. But I love it.”

They also prioritize low-key, family time. An insider previously told Us Weekly, “Kate and William have one important rule whenever it’s George, Charlotte and Louis’ birthday – they clear their schedules and avoid any work calls, unless there’s an emergency, to enable them to give their children their undivided attention.”

Now, we’ll just have to see if the current Princess of Wales makes Prince George a boob-shaped cake when he gets a little older!

Before you go, check out these precious photos that show Princess Diana’s best motherhood moments.