Former O.C. star Mischa Barton, who was hospitalized last month for psychiatric problems, has a simple explanation: her wisdom-tooth surgery! "I had to get through it without proper painkillers because I couldn't take those during work," Barton tells Time Out New York. "So it's been a nightmare… I went through a tough spot where everything compounded on me, and it was like a perfect storm, like everything was happening to me at once." Barton is now starring in the CW show The Beautiful Life, produced by Ashton Kutcher. (Photo: WENN)