Photo by Tyler Golden

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In the latest chapter of Robin Thicke's apparent downward spiral, the singer has added new fuel to the fire.

As revealed in the singer's newly released sworn testimony regarding accusations he ripped off Marvin Gaye, Thicke admits he struggled with a drug and alcohol problem for the entirety of 2013. He also suggests his actual involvement in the writing of his massive hit "Blurred Lines" was extremely minimal.

Having previously told media outlets he and Pharrell Williams were in the studio when the "Happy" singer-producer began "playing a little something and we literally wrote the song in about a half hour and recorded it," Thicke in his April 2014 deposition has changed his tune.

He was just "lucky enough to be in the room" when Williams "wrote almost every single part of the song," Thicke now admits.

When asked directly of his presence when the rhythm track was created, Thicke confessed: "To be honest, that's the only part where — I was high on Vicodin and alcohol when I showed up at the studio. So my recollection is when we made the song, I thought I wanted ... I wanted to be more involved than I actually was by the time, nine months later, it became a huge hit and I wanted credit. So I started kind of convincing myself that I was a little more part of it than I was and I — because I didn't want him — I wanted some credit for this big hit. But the reality is, is that Pharrell had the beat and he wrote almost every single part of the song."

Thicke went on to explain that although he repeated his old version of events last year in interviews, he doesn't remember his statements because he "had a drug and alcohol problem for the year" and "didn't do a sober interview." That would include his Variance cover story last fall and his appearance on Oprah Winfrey's show, for which he now says he showed up drunk and high on Norco — "which is like two Vicodin in one pill," he added.

For his part, Williams' portion of the deposition appears to have gone poorly as well, with the producer being shown a transcription of a song and asked to identify the notes. "I'm not comfortable," he replied eight times when pressed repeatedly, leaving the impression that perhaps he cannot read music.

A trial for the ongoing Marvin Gaye family vs. Robin Thicke battle is set to begin in February 2015.