Justin teased the special treat, with some seriously vague hints, tweeting: "Where am I?" and "What am I up to? :)" He added, "U guys have been asking for this for a while. Get ready. No one was ready for it though, as the crowd went bananas when Justin joined Ari on stage.
Later, he tweeted: "Thank you @ArianaGrande and thank you Miami. I missed the stage. See u soon ;)"
thank u miami babes and thank u @justinbieber!!!!!! ☁️☁️- Ariana Grande (@ArianaGrande) March 29, 2015
Great night. Loved being back on stage. Miami I'm not done yet....- Justin Bieber (@justinbieber) March 29, 2015
JUSTIN'S AND ARIANA'S VOCALS MIX IN PERFECTLY WITH EACH OTHER, THEY HAVE PERFECT CHEMISTRY TOGETHER ON STAGE pic.twitter.com/9t8JjkGP74- ✨ ✨ ✨ ✨ (@BIEBERMMXII) March 29, 2015