The 26-year-old "Timber" singer entered rehab Friday morning, saying in a statement to E! News, "I'm a crusader for being yourself and loving yourself but I've found it hard to practice."
"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."
According to TMZ, K$sha checked into Timberline Knolls near Chicago, the same facility where Demi Lovato entered treatment.
The singer has been showing off a thinner (but healthy-looking) frame for a while now, even sharing her workout "warrior" secrets with Self this summer.
"When I'm eating healthy and working out, it helps me stay sane and exude confidence," the vegetarian, who hikes, runs or rock climbs regularly, told the mag.
Here's hoping she gets well soon.