During her show at the Colosseum at Caesars Palace in Las Vegas on Friday, the 49-year-old singer invited a female fan onstage, unaware of what would happen next.
As seen in footage captured from a fan who was at the show, the woman, who appeared intoxicated, took the special onstage moment to wrap her leg around Dion and hump her idol.
"Let me tell you something. I'm glad you came up onstage tonight," Dion exclaimed. "I'm glad that... I thought you just wanted to come closer to me. But you know what, I'm glad you came closer to me."
"I love you, you love me," Dion sang, trying to recover from the hilarious, bizarre moment.
Security rushed the stage to remove the fan, but Dion urged them to stop. Instead, she tried to console the woman, telling her "it's OK," and that the guards were her "friends."
"We're going to pray. This is 2018," Dion said, before helping the fan offstage herself. "2018, we're gonna make a change."
Watch it all go down in the video below:
Dion took to Twitter one day later to reveal her Saturday show was canceled.
"We regret to inform you that tonight's performance of 'Céline' at @ColosseumatCP has been cancelled," the tweet read. "Céline is on doctor's orders to take tonight to rest. Céline is expected to resume performances at The Colosseum as scheduled on Tuesday, Jan. 9. - TC."
ET has reached out to Dion's rep for comment.
TONIGHT'S SHOW CANCELLED. We regret to inform you that tonight’s performance of "Céline" at @ColosseumatCP has been cancelled. Céline is on doctor’s orders to take tonight to rest. Céline is expected to resume performances at The Colosseum as scheduled on Tuesday, Jan. 9. - TC