Friday, May 2, 2014 4:51am ET by  
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Justin Bieber and Ariana Grande tease duet with studio photo

Justin Bieber and Ariana Grande have all but confirmed that they are working on a duet together.

The news was revealed by the 20-year-old Canadian on Instagram and Twitter, who said:

"Congrats @arianagrande on your number 1 song. #arianabieberduet??"

The 'Believe' man added a photo of himself - looking almost emotional - and Grande in a recording studio.

The pop songstress later replied to Bieber to say: "Thank u justin!! Secret's out now."

The song meanwhile that the 'Beauty and a Beat' man was referring to was Grande's new tune 'Problem', which has reached No.1 on the US iTunes.

The song features a guest rap from Australian star Iggy Azalea.

 

 

 

Listen to Ariana Grande's 'Problem' below: