In the new documentary "I Am: Celine Dion," the iconic singer reveals her ongoing battle with stiff person syndrome (SPS), a rare neurological disorder causing painful spasms and muscle stiffness. Dion, who recently announced her diagnosis, emotionally thanked fans at the premiere for their unwavering support. The film offers an intimate look at Dion's struggle with SPS, showing how it has impacted her singing career and daily life. Despite moments of resilience and humor, Dion breaks down several times on screen, highlighting the harsh reality of her condition. The documentary's raw portrayal of her journey received multiple standing ovations from a tearful audience. Dion's heartfelt message to fans, acknowledging their support, is a testament to her strength and courage. "I Am: Celine Dion" provides a moving insight into the singer's life and struggles, streaming on Prime Video from June 25.