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The music superstar revealed her diagnosis in an emotional video on social media and announced she was postponing her 2023 tour while she focuses on her health. READ MORE: What to know about stiff-person syndrome: SUBSCRIBE: SIGN UP to get the daily GMA Wake-Up Newsletter: VISIT GMA: FOLLOW: TikTok: @gma Instagram: Facebook: Twitter: WATCH: #gma #celinedion #stiffpersonsyndrome