— Ariana Grande (@ArianaGrande) August 8, 2013
But, it looks like Nonna isn't the only one getting some Bieber love. Check out what Justin tweeted to Ariana after she posted the pic of her grandparents with the Biebs.
@ArianaGrande post that pic and tell your grandma she is a cutie
— Justin Bieber (@justinbieber) August 8, 2013
Hmm ... now what picture could Bieber be talking about? Oh, it's probably this one ...