Jimmy Fallon [1] has welcomed a ton of guests [2] to the "Ew!" couch over the years, and the latest is Ariana Grande [3]. She made a surprisingly funny appearance as Alexa Armstrong, one of Sara's best friends. They practice singing and have an impromptu visit from Gary, Sara's stepdad, and Alexa shocks Sara by claiming that Richard Dreyfuss isn't "ew!" They definitely crack up, and it's reminiscent of Fallon's days on Saturday Night Live [4]. Check it out, and if you think this is funny, watch her Celine Dion impression [5] and wait until we get a better look at Grande's acting chops when Scream Queens [6] hits the small screen this Fall!