Whitney Houston was high when she wed: Bobby Brown reveals the first time he saw her do cocaine was in her wedding dress, just moments before ceremony

Bobby Brown is opening up about his ex-wife Whitney Houston's battle with drugs, revealing that he watched her do cocaine on their wedding day.

In a preview of his interview with Robin Roberts that will air Tuesday night of ABC's 20/20, Bobby said that just before the two were married in 1992 he walked in to see his bride and found her hunched over a bureau snorting a line of cocaine.

'That was the first time I had actually saw her do drugs,' Bobby told Roberts.

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Shocking revealtion: Bobby Brown (above) reveals in a new interview that the first time he saw Whitney Houston do cocaine was on their wedding day

Quick high: Bobby says he went in to see his bride and she was hunched over a bureau doing a line of cocaine in her wedding dress (couple above in 1992)

Roberts also showed Bobby a photo from his wedding of him and his wife dancing and asked Bobby what he saw when he looked at the smiling couple. 

'Happiness. I think we're both happy,' said Bobby.

'I was deeply in love with her and, you know, for the rest of my life I think I will have that feeling towards her because she was that one person who knew me. That one person who had no judgment.'

When asked what he thought about Whitney doing drugs on their wedding day Bobby said he did not have much concern for his future wife. 

'She wasn't that. The drugs wasn't her,' said Bobby. 

'She did drugs but drugs didn't do her. She knew how to handle herself. It only made me want to love and protect her more.'

Bobby was also asked by Roberts what it was like to have many people believe for years, and even know, that it was him who introduced Whitney to drugs, which would ultimately claim her life. 

'It wasn't me that started her,' explained Bobby. 

'I take my part and I take it hard for me even being a part of it. But we all have our own minds and some of us are stronger than others.'

In a preview of the interview that was shown last week, Bobby breaks down as he talks about the death of his daughter Bobbi Kristina and tells Roberts just how agonizing it was to spend six months watching her lay helpless and lifeless in a coma after she was discovered face down in her bathtub in January of last year.

Bobbi Kristina was immediately placed on life support and stayed in a medically induced coma until she died at the age of 22 in July.

'The hardest thing I had to do in my life was to tell my daughter to let go,' Bobby told Roberts while fighting back tears.

He then became unable to control himself, saying as tears streamed down his face: 'My baby's gone.' 

Bobbi Kristina was found in her bathtub almost three years to the date that her mother was pronounced dead after suffering a similar fate while staying at the Beverly Hilton for the 2012 Grammy Awards.

Houston was pronounced dead on the scene after being discovered in the bathtub of her suite at the hotel, with accidental drowning, heart disease and cocaine use later cited as the causes of death.

The Fulton County Medical Examiner's report for Bobbi Kristina revealed that her death was caused by 'immersion of face in water complicating mixed drug intoxication.'

He later said of his life after divorcing Whitney in 2007: 'I came into the marriage with money, and I left the marriage with nothing.'

Emotional: 'She did drugs but drugs didn't do her. She knew how to handle herself,' Bobby said of his ex-wife's drug use

Daughter: Whitney was discovered dead in her hotel suite in 2012, with accidental drowning, heart disease and cocaine use later cited as the causes of death Bobby and Whitney's daughter Bobbi Kristina (above with ex Nick Gordon in 2012) died last July after being found in a circumstance very similar to her mother

Bobbi Kristina was just 14 at the time of her parents divorce, and five years later she became the sole beneficiary of her mother's multi-million fortune after Houston's death. 

It was eight months after her mother's tragic passing that Bobbi Kristina announced she was engaged to Nick Gordon, who was raised at times during his childhood by Whitney and who many considered to be a brother-like figure to Bobbi Kristina.

The pair later claimed they had been married in early 2014, but Bobby shot down those statements, saying the two had yet to wed.

It was Gordon who found Bobbi Kristina passed out in the bathtub at their Georgia townhouse, and in the months that followed some accused him of playing a role in his fiancee's death.

The chances of Gordon ever going to trial however decreased drastically following the release of Bobbi Kristina's autopsy report, in which the medical examiner said they could not tell for certain exactly how she died and if it was an accident or possible murder.

Gordon's lawyers have called on Fulton County District Attorney Paul Howard to publicly declare that Bobbi Kristina's death was not a murder, but so far he has refused to make this statement.

It was also Gordon who tried to resuscitate Whitney when she was found unresponsive in her bath-tub just hours before she was due to attend Clive Davis' annual Grammy party. 

Bobby also spoke about this in his interview when asked about the death of his ex-wife and daughter.

'It's not a mystery to me,' Bobby told Roberts. 

'The same thing that happened to my daughter is what happened to Whitney. There's only one person that was around both occasions, only one person who says they were there to protect them.

'And he didn't.'