Prince William is NOT Impressed!

Prince William was photographed this week with a similar expression to the classic one that made American gymnast McKayla Maroney an Internet sensation.

Not impressed by Prince Harry naked, perhaps?

After losing the gold medal in the individual vault finals at the Olympics, Maroney's not impressed face spoke volumes ... and inspired dozens of hilarious parodies.

What do you think William is thinking about?

Maroney said of the meme: "I'm just really focused and really serious, I guess, and I think it's really funny, that Tumblr. It makes me laugh all the time."

After hosting the Olympic Games as UK ambassadors, William and Kate Middleton are currently attending events at the Paralympics, also in the UK.

The young royals were spotted at Wednesday night's Opening Ceremonies, then cheered on the athletes Thursday. So far, Harry has been laying low.