In recent years, Céline Dion, no longer a dominant pop star, has become an extremely endearing weirdo; witness the impossible-to-dislike videos of her meeting Drake and Steve Aoki. And now she has been drawn into the Marvel Universe. Sort of. Dion has a grand, crashing, vintage-style power ballad called Ashes on the soundtrack to the new movie Deadpool 2. And she’s also got a video for the song that features Deadpool himself.

In the video, we see Dion singing the song in the Caesars Palace venue where she’s got her residency. Soon after it begins, Ryan Reynolds shows up, in character as Deadpool, dancing around Dion in high-heeled shoes, doing ballet and flamenco moves. (There are presumably stunt doubles involved, or else Reynolds is a lot more flexible than I could’ve guessed.) It’s genuinely funny in ways that I wasn’t expecting.

Grand, aching, blown-out sincerity has always been Dion’s thing. But here, she’s gamely making fun of her own persona on a grand stage. (The Deadpool soundtracks include a lot of other pop classics, but always in winky ways, and the only other new song on the Deadpool 2 soundtrack is a Diplo/Lil Pump/French Montana collab.) It’s truly charming, and you can watch it below.

Deadpool 2 hits theaters 5/18.