The 30-year-old singer and actress said on Instagram that introducing Dion at the awards show Sunday in Las Vegas made "the best night" of her life.
"Tonight was the best night of my life. What an honor to introduce my idol @celinedion at the @bbmas and meet her after.. she is an kind as she is talented," she captioned a photo of herself with Dion backstage.
Dion performed the hit song "My Heart Will Go On" from Titanic in honor of the film's 20th anniversary. Her rendition earned a standing ovation from the audience and praise from show hosts Ludacris and Vanessa Hudgens.
"Wow, wow, wow! It's going to be hard to top that moment. That was a moment right now," Ludacris said. "Literally, make some noise for Celine Dion."
Dion said in an interview with The Sun's Dan Wootton in April that "My Heart Will Go On" took on new meaning after her husband, Rene Angelil, died in January 2016.
"When my husband passed it became, probably for the first time, our song," she shared. "And when I sing it, I used to sing it for the fans, and now I sing it for us. When I look at the fans, they look at me and they know that I sing it for him, and that's what they want."
Michele is best known for playing Rachel Berry on Glee, and has since starred on Scream Queens. She released her second studio album, Places, on April 28.