Bobbi Kristina `Krissi` Brown - the music icon`s child with ex-husband Bobby Brown - was photographed at a party inhaling the substance nasally through a small cylinder. According to her ex-boyfriend - who took the pictures - 18-year-old Bobbi is addicted to cocaine, just like her mother Whitney was. He told National Enquirer magazine: "I`ve tried to stop her. But all she said was, `I`m just like my mother!` "Whitney needs to see what her daughter is doing to herself. If Krissi doesn`t stop soon, this addiction to cocaine will kill her." The shots - which also include a picture of her sitting next to series of chopped out lines of white powder - were taken at a friend`s house in Alpharetta, Georgia, the town where she lives with her mother. The unnamed former boyfriend - who was in a relationship with Krissi for over two years - insists the teenager`s substance problems are spiraling out of control. Recalling one party they went to as a couple, he said: "Krissi was pretty wired. I also saw her kiss a man and drink a 40-ounce bottle of Budweiser." The magazine also claims she is a marijuana user and heavy drinker. However, Krissi has refuted the allegation she has a cocaine problem and has accused her ex of setting her up for money because the relationship went bad. In a series of posts on her twitter page, she wrote: "The pictures - a former very dear person to me did this. Set me up to make it look exactly what it looks like. God will smite them yes. "But it`s really not what it looks like ┘ People will do anything for money which is extremely sad, and I`m very hurt by this." She also revealed her mother Whitney had been comforting her "to the max" in the wake of the allegations. The 47-year-old singer confessed to being a cocaine addict herself in a 2009 TV interview with Oprah Winfrey and admitted her and her ex-husband Bobby`s drug use spiraled out of control after she starred in hit movie `The Bodyguard` in 1992. She said: "Me and Bobby were lacing our marijuana with base. We would buy a kilo. We were not pipe smoking. "You roll it up and you smoke it in your weed. It`s almost like heroin cocaine speedballs but you level it off with marijuana."