Bobbi Kristina Brown pictured smoking out of a bong in March 2011

Bobbi Kristina Brown has been having a difficult time as she struggles to come to terms with the death of her mother Whitney Houston, but it seems the teen has been troubled for quite some time.

Bobbi Kristina Brown can be seen smoking what appears to be marijuana out of a bong in an image taken from a video filmed in March 2011.

The incident reportedly took place at a party in Statesboro, Georgia, just days after the youngster turned 18.

In a video obtained by the National Enquirer, Bobbi Kristina Brown is seen lighting the bong and inhaling the smoke deeply as she takes one hit followed by another.

It appears almost too much for her as she then can’t stop coughing as she passes the bong to a friend.

A source at the party 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 11 p.m. When I left at 6 a.m. the next day, she was still partying hard.”

The source went on to state that they don’t believe the wild party was a rare occurrence for the daughter of Whitney Houston and Bobby Brown.

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

“She’s obviously a seasoned partier. With the amount of pot and alcohol she was using, I would have passed out, but she was still going strong.”

Last year, around the time this shocking photo was taken, rumors surfaced that Bobbi Kristina Brown had her own problems with cocaine, a drug that contributed to her mother’s death on February 11.

The unearthed video comes as it has been reported Bobbi Kristina Brown is set to star in her own reality TV show.

Apparently Bobbi Kristina Brown went against her family’s wishes by agreeing to do the show, and is set to finalize things in writing in the near future.

“This show is being done against her family’s advice,” a source told Radar Online.

However, sources say that despite Bobbi Kristina Brown’s insistence on participating, her own reported issues with substance abuse are likely to cause problems and appear to already be doing so.

In a recent meeting with the TV network, insiders told the website that the teen appeared to be “impaired”.

“She was slurring her words and said: <<I will show the world I am NOT my mother and will NOT walk in her shoes down her path>>, then seconds later would mutter, <<My mother was just normal, completely normal, someone who did normal things. She just listened to all the wrong people – and did the wrong things>>.”

Parts of the reality show are reported to show her relationship with “adoptive brother” Nick Gordon.

Nick Gordon recently confirmed on Twitter that he and Bobbi Kristina Brown have a romantic relationship, tweeting: “Yeah we got a little closer and what!”

The idea of the reality show was said to have been cultivated last year, long before Whitney Houston’s untimely death.

Bobbi Kristina Brown is said to agree with producers at the network that the timing is now perfect to go ahead with the show on account of all of the curiosity surrounding her.