The actress, 25, checked into Utah's Cirque Lodge this week, a source inside the clinic tells ET.
Eva Mendes recently checked into the clinic. Lindsay Lohan and Mary-Kate Olsen were also treated there.
A rep for Dunst has not returned calls for comment.
Dunst recently signed on to headline the drama Sweet Relief, playing a relief worker who advocated for Iraqi and Afghani victims. She can be seen on the big screen later this year in the comedy How to Lose Friends & Alienate People.
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