Bobbi Kristina Brown visited Whitney Houston's grave on Mother's Day

Whitney Houston's daughter Bobbi Kristina Brown marked the first Mother's Day since the singer's passing by paying an emotional visit to her grave.

Houston drowned in the bathtub at a Los Angeles hotel in February, sending shockwaves around the world, and was later buried next to her father at a cemetery in Westfield, New Jersey.

Now her daughter has told of her heartache as she prepared to visit the superstar's final resting place for the first time on Mother's Day, in May.

In touching scenes from TV show The Houstons: On Our Own, which premieres in the U.S. on Wednesday, Brown says, "At this point in time, I'm completely terrified but I'm going. I'm praying to God that I can get out of this car. I'm praying to God that he gives me strength to keep walking towards her grave."