Anna Nicole's Shrink Checks Into Jail

TMZ has learned Dr. Khristine Eroshevich, the psychiatrist accused of conspiring to fuel Anna Nicole Smith with illegal prescription drugs, is officially behind bars.

The doc was booked at Van Nuys Jail at 11:11 AM PT. Her bail was set at the same price as Howard K. Stern's -- $20,000.

UPDATE -- She was released at 1:58 PM PT.