Selena Gomez sings 'Mario Kart Love Song' with Jimmy Fallon (Video)

Selena Gomez is making her late night show rounds, first appearing on David Letterman’s Late Show and then stopping by Late Night with Jimmy Fallon.

During her appearance on the latter, she sat down for a duet with Fallon, singing Sam Hart’s “Mario Kart Love Song,” and wearing mustaches.

MTV reports Gomez and Fallon genuinely seem to be having a lot of fun doing it.

“You’ll be my toad, and I’ll be your peach.. I may take a shortcut, but I’ll never cheat, I promise,” Gomez sings playfully during the duet, Just Jared Jr. reports.

Gomez’s movie Spring Breakers comes out this weekend, and while promoting it on Letterman’s show earlier this week, she told the audience that she made her ex-boyfriend Justin Bieber cry.

When Letterman told her last time her ex was on the show “He said something, and I said something, and I made him cry,” Gomez quipped “well then, that makes two of us."