Lady Gaga couldn't sing for her Little Monsters, so they sang for her. 

Mother Monster had to reschedule her Joanne World Tour show in Montreal, Canada after powering through heavy rain at an earlier concert at New York City's City Field. Gaga made the announcement via Twitter on Tuesday while the tour’s promoter Live Nation released a statement confirming that the singer had been "instructed by her doctor that she will need to reschedule this evening’s show due to respiratory infection and laryngitis."

Related: Lady Gaga Performs in Pouring Rain at Joanne World Tour in New York

"To my beautiful fans. I couldn't be more devastated that I am unable to perform tonight," Gaga tweeted. "I sing this entire show live, and pride myself in giving it all, but when I sang in the rain at Citi Field I got sick and have been pushing through. I am so sorry to anyone who had their heart set on seeing me tonight. I love you."

Instead of going home, however, the fans headed to Gaga's Montreal hotel to support and serenade her. Overwhelmed by the gesture, Gaga sent them pizzas and autographed copies of the Joanne album and event went up onto the hotel roof to greet the crowd.

GAGA WAS ON THE ROOF pic.twitter.com/z2hPx6DOdy

— Jp Dupuis (@JpDupuis) September 4, 2017

"I can't believe you are singing 'Grigio Girls.' I will make it up to you, I promise, Montreal," she said.

Gaga is next set to perform at the Air Canada Centre in Toronto on September 6 and 7.