Lady Gaga Performs 'Bad Romance' at Toronto Film Festival's 'Gaga 5'2"' Premiere

Kevin Mazur/Getty Images for Live Nation
Lady Gaga performs during her 'Joanne' World Tour at Citi Field on Aug. 29, 2017 in New York City.

The pop icon rewarded her fans by playing the pop hit on an acoustic piano before the world premiere of 'Gaga 5'2"' at TIFF.

Lady Gaga earned a standing ovation Friday night (Sept. 8) at the Toronto Film Festival by performing "Bad Romance" solo on the acoustic piano.

And that was before the TIFF headliner saw her Netflix biopic, Gaga 5'2", hold its world premiere at the Princess of Wales Theater. Gaga had been expected to perform after the film screened, but decided to go on stage beforehand.

She dedicated her slow-tempo performance to the film's director, Chris Moukarbel, who helped present the film to Gaga's rapturous fans. "I'm just floored," the director said after hearing Gaga perform and watched stage-side as she rose from her piano to blow a kiss to her cheering fans, and embrace them with outstretched arms.

"No matter how many times I've seen her, I'm just floored," Mourkabel added. Also helping bring Gaga on stage in Toronto was Cameron Bailey, artistic director of the film festival, who initially thanked IFC Films and Gaumont for bringing Gaga 5'2" to his event.

Just as quickly, Bailey recognized his error. "No, that's incorrect. Thanks to Netflix for bringing us this film," he added. That correction brought a loud and sustained "Yea!" from Netflix content chief Ted Sarandos, who was sitting six rows back and before long rose to his feet to join the rest of the Princess of Wales Theater audience in welcoming Gaga on stage.

Earlier, on Wednesday and Thursday night, the rock star gave her usual high energy performance at the Air Canada Center as Gaga brought her Joanne World Tour to the city for a two-night stand. And on Friday morning, Gaga held a press conference to promote her Netflix film, while also announcing she will "take a rest" from music after the end of her current tour.

Gaga 5'2", directed by Emmy-nominated Moukarbel, offers behind-the-scenes access as Gaga, born Stefani Joanne Germanotta, meets with close friends and family, records and releases her 2016 album, Joanne, and deals with personal struggles.

The documentary is produced by Heather Parry for Live Nation Productions, and CAA brokered its sale to Netflix. The Toronto Film Festival runs through Sept. 17.

This article was originally published on The Hollywood Reporter.