Mary-Kate Olsen has entered a treatment facility for help with a ''health-related issue,'' her publicist tells EW.com. A source close to the actress adds that the issue in question is an eating disorder. ''She dealt with this head-on, in the way she deals with all aspects of her life,'' her publicist, Michael Pagnotta, tells EW.com. ''It's a very difficult thing that she's going through, and she has everyone's support.'' Olsen's increasingly slender appearance in recent months had sparked speculation, but she had never publicly acknowledged a problem.
Pagnotta tells EW.com that Mary-Kate still plans to join her twin sister, Ashley Olsen, at New York University this fall. After years of straight-to-video movies, she and Ashley recently starred in their second theatrical film, ''New York Minute.'' They also hosted ''Saturday Night Live,'' where Ashley referenced eating-disorder rumors in a skit where she played a paparazzo.