Justin wrote "congrats @arianagrande on your number 1 song. #arianabieberduet"
Ariana tweeted "thank u justin!! secrets out now."
You could say that. And now we want details. Song title? Release date? Ah well...before long they'll be teasing snippets and counting down the days.
Check out Ariana's iHeartRadio Music Awards performance of "The Way" and "Problem" (we still can't get over Rihanna having a giggle over Ari's dance moves). As usual, Ariana's voice was flawless.
Are you looking forward to the Ariana and Biebs duet?
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Gallery | iHeartRadio Awards Show Red Carpet Arrivals