By Camille Nzengung
Updated: Nov 09, 2018 @ 5:05 pm

"Age ain't nothing but a number." - Aaliyah and also Prince Charles (probably). 

Though he's about to turn 70 years old, Queen Elizabeth's eldest confirmed he's still got a bit of childlike mischief in his bones, especially when it comes to his little sis, Princess Anne. 

A recent clip from the BBC’s new documentary, Prince, Son and Heir: Charles at 70, shows the Prince of Wales cracking his sister up as only a big brother can.

In the video, the 69-year-old royal can be seen sneaking up behind his little sister and tapping her on her back to surprise her. Princess Anne, 68, finding him funny, turns around laughing before the two continue joking around, with Charles making funny hand gestures.

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The funny thing is, the entire time that Prince Charles is pranking his sister, business seems to be going on as usual in the background. In fact, an announcer can be heard throughout the clip making introductions of royal guests, naming “The Prime Minister of the Republic of Vanuatu” and “The Prime Minister of Jamaica” as just a few of the arrivals.

The Queen, who stands nearby along with Prince William and Prince Harry, appears not to notice her children goofing around. Though, we’re probably guessing that she’s grown used to their shenanigans at this point.

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