Is Justin a fan of Ariana Grande?

When Ariana Grande hit 2.4 million followers on twitter, she posted a comment of Justin Bieber's "Die in Your Arms"- and Justin even saw it1 "Wow.u killed it @arianagrande #dieinyourarms," Justin tweeted. Ariana showed her excitement be tweeting, "@justinbieber yay!! I'm so happy you heard it and liked it. Thank you so much!! That means the world to me. I love #Beleive. #RealMusic."