Jimmy Fallon knows just how to make some musicians feel right at home. The Tonight Show host welcomed newcomer Meghan Trainor to the show's music room recently to belt out her hit "All About That Bass" with his late-night band The Roots on Thursday, Sept. 4.

The 20-year-old took a seat where stars like Idina Menzel and Mariah Carey have sat before to perform her viral smash as The Roots played backup music with tambourines, drums and children's toys. 

"Every inch of you is perfect from the bottom to the top," the group sang. "That booty, booty! Oh, that booty, booty!"

Trainor talked about her catchy body-positive tune — which was released in June via YouTube — to Entertainment Weekly last month. "It makes me tear up," she said of the overwhelming positive feedback. "I never thought I'd have a fan in my life. And now I've got all these young people that seem to love me. That’s the craziest part for sure."

Up next, the Massachusetts native is gearing up to put out new music. "My album’s almost done! It's so good. It's pretty unique and different from anything you can hear out there. And that's what I love about it," she added. "And it's got the throwback in there, but I snuck some reggae in there and clever fun lyrics and catchy melodies. I think it'll be good."

Watch the video now!