Ke$ha's mother joins daughter in rehab center

Ke$Ha's mother has checked herself into the same rehabilitation center as the pop star.

Pebe Sebert claims she is suffering post-traumatic stress disorder (PTSD) and has entered the treatment facility where her daughter is being cared for near Chicago, Illinois.

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

The Tik Tok hitmaker entered the residential rehabilitation center earlier this month (Jan14) to seek help for an eating disorder.