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If you know anything about Prince George and Princess Charlotte, then you know they have discerning taste (read: winter sports, sunglasses and satchels).  

So at today’s Royal Air Force Centennial celebration, Char decided to flaunt her taste (buds) with two tried and true facets from her big brother’s public affair playbook: windows and sticking out his tongue.

Prince George sticking his tongue out
Chris Jackson/Getty Images

Ever the royal envelope pusher, Princess Charlotte took George’s “tongue out, windows up” move a step further and casually licked a Buckingham Palace window during the RAF flyby. 

The rest of her fam watched the plane parade from a balcony below.

Char and George’s version of trendsetting is definitely a dish best served with a side of Windex. (Just don’t tell Gan-Gan.) 

RELATED: Princess Charlotte Snagged *This* Important Role in Princess Eugenie’s Upcoming Wedding

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