Céline Dion’s upcoming documentary officially has a premiere date. “I Am: Céline Dion” will drop on Amazon Prime Video June 25, and the Canadian singer, 56, shared the first look of the project on Instagram Tuesday.The feature is set to take a look at her music career and her struggles with the autoimmune neurological disorder, stiff person syndrome.The image shows Dion thrusting her fist in the air as she appears to shout.