Lady Gaga has been open about her past cocaine use, but a former best friend claimed the singer's drug use was worse than she admitted.

Gaga's former BFF, Brendan Jay Sullivan, spilled intimate details about the Born This Way singer's drug-addled life she led before she became famous. He revealed the shocking scenarios in the upcoming book, Rivington Was Ours: Lady Gaga, The Lower East Side and the Prime of Our Lives, which will arrive in bookstores on Aug. 27.

Radar Online obtained excerpts from the book, one of which Sullivan recalls hanging out with Gaga at her apartment in Manhattan's Lower East Side section. He shared a time when he watched her take white powder from out of her carpet and rub it into her gums. She told him it was mint and that she wished it was cocaine.

Sullivan recalled another encounter when Gaga admitted to using "bags and bags" of cocaine.

"Mostly when I was getting ready to go out, while I was putting on my makeup," Sullivan recalled the singer telling him. "I'd get a delivery and then put on some Bowie and treat myself in the mirror. But I only ever did it alone. That was my one rule."

Sullivan also shared two separate incidents when Gaga asked him to help her get cocaine. The first time took place in Manhattan's Don Hill's nightclub. After he agreed to supply her the drug through a dealer, he said he regretted the decision because he became concerned it would affect her vocal chords.

"I just agreed to score drugs for us both and spend our entire night smoking way too many cigarettes and talking way too fast about ourselves," Sullivan wrote. "Then, I started to worry. She had a recording session in L.A. the next week. What if it ruined her voice?"

Concerned, he didn't buy the drug from the dealer after all. He described another incident when she asked him to "score" for her. Sullivan wrote that Gaga asked him to "call Judy.'"

"Judy is what my friends all cocaine," he wrote.

Gaga told Vanity Fair in her cover story that she occasionally used cocaine in her interview in 2011.

"I won't lie; it's occasional. And when I say occasional, I mean maybe a couple of times a year," Gaga told Vanity Fair for the September 2011 issue. She explained she was a drug user because she was "mental." She said at one point became so depressed that she "bottomed out" and had to go back to her parents to be cared for.

"I was completely mental and had just been through so much," Gaga confessed. "All I will say is I hit rock bottom, and it was enough to send a person over the edge. My mother knew the truth about that day, and she screamed so loud on the other end of the phone, I'll never forget it. And she said, 'I'm coming to get you.'"

Gaga said she went through the dark period because she went through many rejections while pursuing a singing career.

"I cried. I told her I thought my life was over, and I have no hope and I've worked so hard, and I knew I was good," Gaga said.

Gaga recently announced that she will release her third album this year. The singer shared details about her highly anticipated album and as-yet-revealed single on her Facebook page on July 15. The statement revealed that ARTPOP will drop on Nov.11 and fans can pre-order the album through an app beginning Sept. 9. The first single will drop on Aug.19, a week before the 2013 MTV Video Music Awards.

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