Fresh off the heels of telling David Letterman and the world that she made her ex-boyfriend Justin Bieber cry, the ‘single’ Selena Gomez proves yet again that she’s totally moved on.

The Spring Breakers star was spotted last night on Late Night With Jimmy Fallon wearing a fake mustache. And that’s not all. She even sang a duet with the host titled “Mario Kart Love Song.”

Watch Selena and Jimmy sing Mario Kart Love Song (cover of Sam Hart’s original) in the video clip below: