Multi-platinum r'n'b songstress Deborah Cox has revealed that she is praying for Bobbi Kristina Brown, who has been in a coma since being found face down in bathtub over two months ago.

Speaking to Us Weekly, the Canadian singer and songwriter said that while she isn't close to the family she wanted a miracle to happen for the 22-year-old daughter of Bobby Brown and the late Whitney Houston.

"It's very sad. I've said my prayers," the entertainer said. "I hope for a miracle."

Cox, who is best known for her 1998 hit Nobody's Supposed To Be Here, also defended the controversial Houston biopic directed by Angela Bassett.

The 40-year-old recorded the vocals for the Lifetime movie which was slammed by many, including Whitney's mother Cissy Houston. The made-for-TV movie, which focused on the turbulent relationship of the singer and her former husband Bobby Brown, premiered in January.

"There was a lot of mixed feelings. It is a sensitive thing, but it's a very complex situation," Cox told the publication, adding: "I really just wanted to honour her and this was a way to do that. I've always loved her music so it was a great tribute."

"I didn't hear anything from the family. There was something between Lifetime and the family that was a bit awkward ... But all of us as a team wanted to make sure the music sounded authentic," she added.

Bobbi Kristina has been on life support since she was found face down in a bath at her Georgia home on 31 January. After almost two months Georgia's Emory University Hospital, the aspiring actress was moved to DeKalb Medical facility in Atlanta, which is said to be better for long-term care.

Bobby recently opened up about his daughter's condition and the ordeal his family is facing, admitting it had been "rough".

"Rough times are rough times, hard times are hard times I dunno what the hell I am going through right now, but I am giving it to God and letting him deal with it," he said in an emotional outburst at the Soul Food Festival ​in Los Angeles- his first public appearance since the tragedy occurred.