A video of Whitney Houston's daughter Bobbi Kristina Brown allegedly smoking a bong has surfaced online.

The video appears to show the late singer's 19-year-old daughter smoking using a three-foot-log bong before having a coughing fit.

In the vid – apparently filmed at a party held in Statesboro, Georgia in the US in March of last year - the girl in the vid can be heard asking for a lighter before taking several hits of the bong.

A source allegedly told Radar Online: “Bobbi Kristina was staying with friends at the school and she brought along a big bag of pot for the party.

"The party was well underway by the time I got there around 11pm. When I left at 6am the next day, she was still partying hard.”

“Between tokes, Bobbi was drinking shots of Grey Goose and Skyy Blue vodka, and sipping a mixed vodka drink."

Since her mother died concerns have been raised about Bobbi Kristina's welfare after she was hospitalised twice after Whitney's death. She also sparked rumours that she had got engaged to her 'adoptive brother', Nick Gordon, after she was spotted wearing a sparkler on her wedding finger.

The video was exclusively obtained by EnquirerPlus, the new iPad app that features content from the National Enquirer. Available in the iTunes app store and find more information on the EnquirerPlus Web site. The Bobbi Kristina video first appeared on EnquirerPlus.