Watch Celine Dion Teach Katy Perry How To Do Her Iconic Chest Slap Backstage On Her ‘Witness’ World Tour

Who knew Celine Dion was such a big Katy Perry fan.

The Canadian singer got to meet Perry backstage on her “Witness” World Tour stop in Melbourne, Australia on Saturday.

Perry shared a video on Twitter of her meeting with Dion, including the moment the “My Heart Will Go On” singer taught her how to do her signature chest slap.

… and hilarious too! Never grow up @CelineDion 💘 pic.twitter.com/sbXzzNrbRW

— KATY PERRY (@katyperry) August 7, 2018

Dion also posted a photo from the incredible meeting on her Instagram account, writing, “You’re the best Katy, thanks for the amazing show.”

View this post on Instagram

A « California Girl » and a girl from Quebec meet in Australia! You’re the best Katy, thanks for the amazing show! Love you… – Céline xx… . Une « California Girl » et une fille du Québec se rencontrent en Australie! Tu es la meilleure Katy, merci pour ce spectacle incroyable! Je t’aime… – Céline xx… . 📸 @sydneylopez

A post shared by Céline Dion (@celinedion) on Aug 5, 2018 at 8:15am PDT

Perry also posted a photo with Dion, writing in all-caps, “CELINE DION SHOWED ME HOW TO DO THE FAMOUS CHEST SLAP AND I DID IT TO HER WHILE SINGING FIREWORK AND I BECAME A FIREWORK.”

View this post on Instagram

CELINE DION SHOWED ME HOW TO DO THE FAMOUS CHEST SLAP AND I DID IT TO HER WHILE SINGING FIREWORK AND I BECAME A FIREWORK

A post shared by KATY PERRY (@katyperry) on Aug 5, 2018 at 9:25am PDT