The 22-year-old pop star, who was joined on stage by her adorable dog Toulouse, was accompanied by her mother Joan and her grandma (a.k.a "Nonna"), who sat in the audience, along with her brother, Frankie Grande.
While talking about her adorable family, Grande mentioned that her Nonna had a bit of a crush on the Tonight Show host.
"When I told her I was going to take her here to meet you, she was like, 'I gotta start planning my outfit,' and I was like, 'Nonna what do you think is going to come from this?' And she goes, 'You never know, I'm very naughty,'" Grande shared.
Fallon couldn't help but giggle and blush, but he also threw Nonna a little wink as well.
Then it was Fallon's turn to embarrass someone: Grande's mother. The host played a video the singer recorded of her mom listening to her new album for the first time and absolutely freaking out over how good it is.
Joan, who looked mortified in the audience before the clip aired, couldn't help but smile as Grande blew her a kiss from the stage.
As the show cut to commercial, Fallon jogged up into the audience where he hugged Joan and Frankie before showing Nonna some extra special love.
Grande, who went on to perform her hit single "Dangerous Woman" to close out the show, also recorded an awesome Lip Sync Conversation sketch, which is seriously worth watching. (There’s even a nod to one of Beyonce’s new Lemonade tracks!)