Demi Lovato & 6 More Music Stars Who've Gotten Grossed Out With Jimmy Fallon on 'Ew!'

Andrew Lipovsky/NBC
 Jimmy Fallon as "Sara", singer Demi Lovato, and writer A.D. Miles during "Ew!" on The Tonight Show Starring Jimmy Fallon on March 27, 2017.

Including Ariana Grande, Taylor Swift, Jennifer Lopez and more.

Jimmy Fallon unveiled the latest episode of his faux TeenNick series "Ew!" on The Tonight Show Monday night with guest Demi Lovato playing one of Fallon's character Sara's "besties forever and ever," Emily.

The sketch brought the silly as the two gal pals discussed their upcoming Spring Fling dance, took emoji selifies ("or as I like to call them, emojelfies") and practiced kissing on pillows of Ed Sheeran and Mario Lopez. And, of course, the annoying stepdad Gary (A.D. Miles) had to show up to spoil their fun with an offer to chaperone before breaking out a song about having fish sticks for lunch.  

Watch it here:

In celebration of the ridiculous parody and all the amazing musical guests it has hosted, we look back at our six other favorite "Ew!" episodes so far.

With Zac Efron and Seth Rogen

In Fallon's first take on "Ew!," the Tonight Show host shakes it to Lil Jon's "Turn Down for What" with Zac Efron and his Neighbors co-star Seth Rogen. Props to Efron for making a particularly cute teenage girl. 

With will.i.am

Beyond all the big-name guest stars "Ew!" has hosted, the recurring sketch's most memorable musical moment is probably the song collab Fallon did with The Black Eyed Peas' will.i.am that impressively hit No. 26 on the Billboard Hot 100 chart in 2014. In the official song and video, will.i.am plays mir.i.am and raps with Sara about everything gross in the world. As mir.i.am puts it, "I am not hating, I'm merely conversation with my BFF Sara."

With Ariana Grande

Maybe more than any of Fallon's other teen-actor-turned-popstar guests, 23-year-old Ariana Grande fits right in on "Ew!" She did, after all, get her start on the Nickelodeon series Victorious before breaking out to star in the spinoff Sam & Cat. Here, she plays Sara's friend Alexa and the two stage a sing-off. Guess who wins. Still, props to Fallon, who's notorious for breaking character mid-sketch, for holding it together while Grande was the one to breakdown laughing. 

With Jennifer Lopez

Jennifer Lopez plays Sara's friend Gabby, who is visiting all the way from Los Angeles. The two put on a talent show and while Sara's skill for balancing a spoon on her nose is pretty impressive, Gabby really shows off with some dance moves she presumably picked up from the block. 

With Taylor Swift

Not all of Sara's guests can be cool like her. Here, Taylor Swift plays Sara's mom's friend's daughter Natalie who's about as awkward as you get. She even makes Gary the stepdad look hip. 

With Miley Cyrus

When Miley Cyrus teams up with Sara, she becomes "Becky with the good moves," as Sara's stepdad Gary called her. Becky and Sara take turns posing for memes after complaining about the Grand Canyon's lack of Wi-Fi, all while recalling Cyrus' early years as Hannah Montana.