Justin Bieber and Selena Gomez are reportedly working on a new song together.

According to The Sun, the on/off couple have recorded a collaboration called Unfamiliar, with the pair seen together at The Hit Factory in Miami last night (April 9).

The newspaper reports that JB and Sel-Go had a 'late-night rendezvous' at the studio - where the 20-year old superstar has been busy working on his new album.

It is thought Selena arrived with a friend, with Bieber meeting her at the door, dressed in a red snapback and white T-shirt.

As well as hooking-up with Gomez on a track, Justin has also been in the studio with 15-year old Madison Beer - later posting a snap of them together on Instagram.

We can only presume the snap was taken the same day as Selena's visit, as Biebs can be seen wearing the same outfit.

Justin and the Come & Get It singer are yet to address their relationship status, with the pair sparking reunion rumours last month after JB posted a video of himself and Selena dancing intimately to John Legend's hit track, Ordinary People.