Mariah Carey has recorded an impromptu collaboration with Justin Bieber after he paid her a visit while she was working with rapper French Montana.

The Hero hitmaker shared the news of the unlikely team on Instagram.com on Friday (31Jul15), when she posted a photo of the trio with producer Eric Hudson, who has previously worked with both Carey and Bieber.

She simply captioned the snap, "#comingsoon".

Bieber reportedly stopped by the Hollywood studio where Carey was recording on Thursday night (30Jul15) to hear the superstar in action, and she was so taken by the 21 year old, she invited him to add his vocals to her tune with Montana, reports TMZ.com.