Miley Cyrus collaborated on an a capella version of We Can't Stop with The Roots and Jimmy Fallon as a guest on Fallon's late night show.

"Holy moly! Number one in seventy countries," Fallon congratulated Cyrus on the success of her new album, Bangerz, while welcoming her on his show.

Cyrus -- who was only wearing an oversized white shirt -- let Fallon know that she was catching pneumonia in his studio. "It's very cold but you have to wear clothes when you come on here," Fallon responded. Cyrus said she did ask if she could bring a blanket with her but they looked at her like she was crazy.

While discussing the a capella version they recorded for the show, Cyrus suggested that she would like to take the Roots on the road with her the next time she toured.

Cyrus went on to poke some fun at Fallon when they talked about how she nailed the song in two takes while he had to sit on it for over two hours.

"I loved the shame that came over his face when I gave you the 'homegirls with the big butt' cause we know who we are talking about," she said. Cyrus added that she was thinking about Fallon while penning those lyrics.

"I used to always get that in high school, what a big butt I have," Fallon jokingly confessed.

Fallon went on to discuss Cyrus' gig hosting Saturday Night Live and nailing the challenge of having to perform live.

"I think that was a good time for me to show people that I don't just twerk and lick stuff, I can sing, and I can act a little bit too," she said.

Watch the video here:

Watch a clip from Cyrus' interview with Fallon:

Tags: Miley Cyrus The Roots