"I'm a crusader for being yourself and loving yourself but I've found it hard to practice," the singer, 26, said in a statement. "I'll be unavailable for the next 30 days, seeking treatment for my eating disorder ... to learn to love myself again. Exactly as I am."
Best known for songs such as "Tik Tok" and "Die Young," Ke$ha is reportedly at Timberline Knolls rehab center near Chicago, the same place where Demi Lovato received treatment.
Ke$ha most recently collaborated on the chart-topper "Timber" with Pitbull.