Céline Dion kicked off her comeback concert tour with great fanfare. “Finally, it’s amazing we are all together,” Dion, 58, told concertgoers at her Saturday, September 12, concert at the Plenitude Arena in Paris. “I made a promise to come back and to be back on stage.” She continued, “So here I am, singing for you, singing for me, singing life.” Dion was diagnosed with stiff-person syndrome, a rare neurological condition that causes muscle stiffness and painful spasms, in 2021 and publicly disclosed her health condition the next year. She subsequently canceled her Courage World Tour in 2023 to prioritize her health. Related: Inside Celine…