Peter Gallagher expressed profound gratitude for Mischa Barton, his former co-star on 'The O.C.', stating he is thankful she is 'still alive' after experiencing the toxic pressures of early fame. Barton, who was just 16 when she starred as Marissa Cooper, endured significant personal struggles, including a DUI arrest in 2007 and a mental health crisis that led to hospitalization in 2009. She described her breakdown as 'terrifying' and likened it to the film 'Girl, Interrupted', emphasizing that she was never suicidal but rather overwhelmed and depressed. Gallagher reflected on the dangers of fame, stating, 'First fame is toxic. First fame can kill you.' Barton later acknowledged that she had to step away from the spotlight to focus on her health and find balance in her life. Today, she feels stronger and is looking forward to new opportunities, having learned valuable lessons from her experiences.