Mariah Carey sparked concern after video from her recent show in Las Vegas was posted online.
A brief clip posted by a fan captured Carey, 55, delivering a performance lacking in energy.
The video, which was posted last week, prompted numerous fans to weigh in with their concern, with one asking if she was 'in pain.'.
Carey is just days away from concluding her Las Vegas residency, The Celebration of Mimi, which began last year.
According to the source, the possible couple is also interested in collaborating professionally, as they added: 'They also want to collab with music, but just like their relationship, they aren't forcing anything, they are letting it all happen naturally, letting life happen.'.
