Dunst, who is working on the film "All Good Things" in New York, reportedly checked into the Cirque Lodge treatment center in Utah earlier this year.
"I didn't go to Cirque Lodge for alcohol abuse or drug abuse," Dunst told E! News exclusively. "I went there for depression. ... It was a good six months before I decided to go away. I was struggling and I had the opportunity to go somewhere and take care of myself. I was fortunate to have the resources to do it. My friends and family thought it was a good idea, too. But I didn't know where to go. My doctor recommended Cirque Lodge."
Dunst, 26, has starred in "Wag the Dog," "The Virgin Suicides," the "Spider-Man" trilogy, "Marie Antoinette" and "Elizabethtown."