Alyson Stoner checked into rehab after becoming "medically underweight" as she prepared to audition for the lead role in 'The Hunger Games' films. The 'Cheaper by the Dozen' star has revealed she was one of the actresses who auditioned for the part of Katniss Everdeen, which eventually went to Jennifer Lawrence, and she embarked on a restrictive diet and exercise program that left her in a downward spiral. She has now revealed she checked herself into rehab to get help, telling 'Access Hollywood': "I am not sure I have ever shared this explicitly, but I was auditioning for 'The Hunger Games' for the lead role, Katniss.