I can't find what movie or show this is from.Help is very much appreciated.?

I know it's very random but I can only remember this one scene. It's either from a movie or show,real life not cartoon. It's 2 girls I think, one is mimicking the other one making it seem like it's a mirror. Because she doesn't want to get caught. She shows her teeth then smacks her butt. I remember it being a funny movie. I think it's for a young audience.

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