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Justin Bieber just shaved his mustache, but now Selena Gomez has one of her own!

OK, it's fake, but still impressive. Tuesday night on Late Night With Jimmy Fallon, the Spring Breakers star performed a duet of "Mario Kart Love Song" with the talk-show host.

The 20-year-old brunette beauty wore a white-and-blue mini-dress and, naturally, a Princess Peach crown. Jimmy also donned a fake mustache along with Mario's trademark red hat, singing and playing guitar for the duo's cover of Sam Hart's original song.

Wala wala wala waluigi! Watch the adorable clip and let us know in the comments what you think.