The 22-year-old singer gave Jimmy a dinosaur onesie as a gift when she arrived on the show. Jimmy put his onesie on and continued to interview Meghan, while they both rocked their animal onesies.
Meghan also talked about the last time she was on the show, when she fell after her performance.
She and Jimmy spoke about the tumble, and Meghan shared that even though they re-shot her performance, she decided to let the show air her fall because she felt she sounded better during her first performance.
Watch a clip from the show below!
Meghan Trainor on The Tonight Show with Jimmy Fallon