Justin Bieber and Usher have debuted their latest duet, ‘The Christmas Song (Chestnuts Roasting On An Open Fire)’.

R&B superstar Usher called into Ryan Seacrest‘s popular ‘On The Air’ radio programme to offer him the first ever spin of the modern rendition of the song made famous by Nat King Cole.

Speaking to Seacrest, Usher said: “Justin and I did the classic record ‘Chestnuts Roasting On An Open Fire’… It’s a record that has always been one of my favorites, and I’m happy that I was able to share it with Justin.”

Speaking about Bieber’s upcoming holiday album, due for release on November 1st, Usher went on to say, “The album is full of surprises, Justin’s ‘Under The Mistletoe’ is going to be incredible”.

After Usher made the call, Bieber tweeted his 13 Million followers, saying: “Well @usherraymondiv made call. looks like u guys get #CHESTNUTS on monday now from @RyanSeacrest and ITUNES #3days #OCT24th – LEggo!”

A number of artists have already been confirmed for the album, including The Band Perry, Mariah Carey, and Boyz II Men. Fans are also eagarly awaiting the unveiling of a mystery collaborator on the album, who has only been described by Bieber’s manager, Scooter Braun, as “[One] of the most legendary performers ever”.

Watch a behind the scenes video of Usher and Bieber in the studio recording ‘The Christmas Song’.

Under The Mistletoe Webisode – Usher and Justin in the Studio (The Christmas Song – Chestnuts):