Speaking with 'Vogue,' Celine Dion breaks down her surprise appearance at the GRAMMY Awards amid her battle with Stiff Person Syndrome. The songstress calls her return to the public eye 'nervewracking' and a 'big honor,' with Celine presenting the Album of the Year award to Taylor Swift. As for the massive reception after she walked on stage, Celine admits it's always 'very touching when you have a standing ovation.'