LAS VEGAS, NV - SEPTEMBER 21: Singer Ke$ha performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Are
Denise Truscello/Getty Images for Clear Channel

The saga involving Ke$ha's recent stint in rehab for an eating disorder has become even more heartbreaking then it already was.

Now the "Animal" singer's mother, Phebe Sebert, is joining her daughter at the same Chicago-area treatment center for post-traumatic stress disorder.

"I'm checking myself into Timberline Knolls today for post-traumatic stress disorder, at Ke$ha's urging," Sebert told People yesterday.

Sebert's decision was made just one week after her daughter's rehabilitation began and only days after she told People that she believed that Dr. Luke was the reason her daughter became sick.

"Dr. Luke had been telling her how she had to get in shape and lose weight and all this stuff," Sebert said. "She was exercising and dieting and ultimately doing everything she could, but not getting thin fast enough. And that's when she first became bulimic."

She also claimed that the producer, who signed Ke$ha back in 2005 at the age of 18, said that the wild popstar looked like a "refrigerator" in her last music video.

Dr. Luke's rep denied the accusation.