Robin has recently been involved in a plagiarism lawsuit, and in transcripts recorded from an April deposition, the singer revealed that he "didn't do a sober interview" while promoting the hit single with Pharrell Williams. "I was high and drunk every time I did an interview last year," he stated.
He also admitted he lied when he claimed to have co-written the track, insisting that Pharrell "geniused the whole (song)".
"The record would have happened with me or without me," Robin says in documents obtained by the Hollywood Reporter. "None of it was my idea… I was drunk… (and) I'd say 75 per cent of it was already done when I walked in."
Robin later touched on his very public split from Paula, amid rumours of his infidelity.
Asked by a lawyer whether he "picks and chooses when to tell the truth", he replied, "Absolutely not. I told my wife the truth. That's why she left me."
The testimony was taken from deposition Robin and Pharrell made as part of an ongoing legal dispute with the family of Marvin Gaye over whether Blurred Lines lifted beats and rhythms from Marvin's 1977 track Got To Give It Up.
Robin testified that he had nothing to do with writing the song, claiming that he lied in multiple interviews out of career jealousy.
"After making six albums that I wrote and produced myself, the biggest hit of my career was written and produced by somebody else, and I was jealous and wanted some of the credit," he stated.
The publishing royalties he receives for the track – around 20 per cent – is down to Pharrell's "generosity".
"(I get) a larger percentage of publishing than I deserve," he said.