Jimmy Fallon almost stopped his show after Ariana Grande gave an incredible minute-long rendition of a children's song

Grande, who is best known for her songs "Break free," "Bang bang," and "Problem," joined Jimmy Fallon on "The Tonight Show" Tuesday evening.

The pair played a game, "Wheel of Musical Impressions." Grande's first task was to give an impression of Britney Spears singing "Mary had a little lamb."

She nailed it, of course.

But the best performance was her next spin, after which she had to sing "The wheels on the bus" like Christina Aguilera.

After a jaw-dropping minute-long performance, Fallon told her he wanted to buy the single and wasn't sure they should continue playing the game because nothing could top it. "We should stop the show right now," Fallon said, giving her a standing ovation.

Here she goes. The Christina bit begins at the 2:14 mark: