’s mother is speaking out about the circumstances that led her daughter to check herself into rehab for an eating disorder this month.

In an interview with Radar Online, Pebe Sebert explained that her 26-year-old daughter had been pressured not only by record producer Dr. Luke but by an unnamed advisor as well.

“It wasn’t just Luke. She had an advisor who told her he had a meeting with a record company and they said she better lose 15 pounds in the next 30 days,” she told Radar.

Sebert alleges that her daughter was told that it didn’t matter if she had to vomit or use illegal drugs, “but she had to lose the weight.”

The pop star’s mother, who has made regular appearances on her daughter’s reality series, “Ke$ha: My Crazy Beautiful Life,” says she has been aware that her daughter was throwing up to lose weight for some time.

“I knew at some point she’d done it. I told her it was dangerous… her teeth, her voice,” she said. “She’d swear she wasn’t doing it anymore, but had a breakdown right before Christmas and told me she’d been doing it pretty much on a daily basis since two months after she signed with Luke.”

Ke$ha originally signed with Dr. Luke, who produced the latest records from Katy Perry, Miley Cyrus and Robin Thicke, in 2005 before signing a deal with RCA Records in 2009.

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