Before Ariana Grande became a pop star, she would imitate pop stars. Years ago, when she was still on Nickelodeon's Sam & Cat, Ariana used to post spot-on impressions of Celine Dion, Britney Spears and Shakira. So of course, when Tonight Show host Jimmy Fallon played against her in "Wheel of Musical Impressions" last night, he didn't stand a chance. Ariana ended up singing "Mary Had a Little Lamb" as Britney would do it, "Wheels on the Bus" like Christina Aguilera and the Weeknd's "Can't Feel My Face" if Celine Dion was to cover it. Now, just one question remains: Who does the better Britney impression, Ariana or Xtina?

Ariana also announced on The Tonight Show that her debut single off her third album Moonlight, "Focus," is due out October 30. Until then, see her latest impressions below.