As they strolled into Westminster Abbey yesterday for Prince Philip’s Thanksgiving ceremony, Prince George and Princess Charlotte were the epitome of well-behaved royal youngsters.

The two eldest children of Prince William and Kate Middleton proceeded to their seats behind The Queen, holding hands with their parents.

During the event, the couple sang songs with the rest of the 1,800 guests and could be seen sitting peacefully listening to the service.

That is until Princess Charlotte displayed her mischievous side in a blink-and-you’ll-miss-it moment.

While the funeral was airing, the Twitter account Royal Reporter shared a video of Kate and Wills’ daughter’s reaction when she realized her face was on TV.

Charlotte can be seen peering up at the ceiling, leaping out of her skin, and making a weird expression in the five-second film.

“The expression when you watch yourself on TV,” they captioned the video.