In the sketch, Fallon reprises his role of Sara while the 24-year-old singer-songwriter plays Natalie, a new friend from out of town. Watch the pair bond over a variety of topics including made up mythical creatures, Band-Aid collections and whether or not you should ever get back together with an ex. (Spoiler Alert! Never ever ever ever do it.)
"The Tonight Show starring Jimmy Fallon" airs weeknights at 11:35 p.m. ET on NBC.