Sara's got a new friend! Ariana Grande joined Jimmy Fallon on The Tonight Show for his hilarious recurring sketch "Ew!' on Friday, Mar. 20. The "Problem" singer played Alexa Armstrong and was, like, totally bummed.

"I posted a pic on [Instagram] and it only got like three likes. I'm literally dying," she said.

Fallon, playing Sara, quipped back: "Ew, that's, like, not a lot of likes!"

"I know," Grande said, "and one of them was from my dad!"

The gal pals took a best friend selfie together and Big Sean's girlfriend even showed off her amazing vocals. Earlier in the show, the star did her best singing impression of Celine Dion — and nailed it!

PHOTOS: Ariana on the red carpet

Grande is just the latest star to join Fallon on the "Ew!" couch. Other famous guests have included Taylor Swift, Will Ferrell, Channing Tatum, Emma Stone, First Lady Michelle Obama, Lindsay Lohan, Zac Efron, and Seth Rogen.

Watch Grande's appearance above and see the "Ew!" supercut video here.