Does Ariana's grandma love Justin Bieber?

When Justin Bieber invited Ariana Grande to join him for a few performances on his Believe tour, he never thought he'd gain a new, slightly older Belieber. "My grandma is now in love with @justinbieber," Ariana tweeted after her whole family checked out the show to support her. When Justin found out, he quickly returned the love over twitter. "@ArianaGrande tell grandma I said what up- LOL. Welcome to the tour!" he tweeted. After that, grandma must have blushed because Ari replied, "@justinbieber you're crazy and nonna says thank you, she loves you."