Avril Lavigne

On the Toronto leg of her Sour tour, Olivia Rodrigo welcomed Avril Lavigne to the stage for a joyful duet of Lavigne's 2002 hit “Complicated.

“Jumped up to sing ‘Complicated’ on stage with @oliviarodrigo in Toronto tonight,” Lavigne wrote after the performance on Instagram. “It was very sweet to perform with you tonight on your SOUR tour!! Both singers were in very on-brand plaid skirts, and Rodrigo (clearly a huge fan) greeted Lavigne with a big hug. Watch Avril Lavigne Join Olivia Rodrigo On “Complicated” In Toronto

On Friday, April 29, Olivia Rodrigo surprised the audience at her SOUR tour in Toronto with a special guest, pop icon Avril Lavigne for a duet of ...

They also had matching short plaid skirts, Rodrigo in blue and Lavigne in red, and Lavigne was wearing a black leather jacket on top. Lavigne posted some photos and video clips of the moment on Instagram as well, captioning the images with, “Jumped up to sing “Complicated’ on stage with @oliviarodrigo in Toronto tonight. Pop icon Avril Lavigne took to the stage to sing her classic teen bop “Complicated,” a song that's as fun to wail along to now as it was when it was released.

The moment you've been waiting for since Olivia Rodrigo dropped her pop-punk breakup album, "Sour," is finally here.

From there, the pair rocked out to every millennial's go-to karaoke track in Y2K plaid skirt looks. “I can't sing her praises enough,” Rodrigo said in one video shared on Twitter. “She's from Canada. And I'm so so so lucky because she came here tonight to sing with me.” By that point, you could hardly hear her say, “please give it up for Avril Lavigne” over all the screaming. Rodrigo introduced Lavigne as the woman who “broke down so many barriers and opened so many doors to girls like me,” before revealing her duet partner's name.

Olivia Rodrigo was joined by Avril Lavigne during the Toronto stop of her SOUR tour. See video of the pair performing "Complicated" together here.

This isn't the first time Olivia has shown her appreciation for Avril. She opened her tour with a cover of “Complicated” and once remarked that she was a “massive fan." Avril took to Instagram, sharing a photo of the two mid-song, with the caption, “Jumped up to sing “Complicated” on stage with @oliviarodrigo in Toronto tonight. Yes, that's right, the two performers responsible for a good chunk of the tracks on your breakup playlist sang together.

Olivia Rodrigo brought Avril Lavigne onstage last night in Toronto to duet "Complicated" together. Watch footage of the show here.

Both donning plaid miniskirts and platform Dr. Martens boots, Lavigne took to Instagram after the show to return the kudos: “Jumped up to sing ‘Complicated’ on stage with @oliviarodrigo in Toronto tonight,” she wrote. She’s from Canada, and I’m so, so, so lucky because she came here tonight to sing with me.” Judging by the instant uproar of applause, those were the only clues the audience needed to figure out who the special guest was. Finally, in a glorious full-circle moment, Lavigne joined Rodrigo onstage in Toronto last night to duet the song together.

Avril Lavigne joined Olivia Rodrigo onstage to sing 'Complicated' during the Toronto stop of her 'Sour' tour.

“It was very sweet to perform with you tonight on your SOUR tour!! “Jumped up to sing ‘Complicated’ on stage with @oliviarodrigo in Toronto tonight,” she wrote. Olivia Rodrigo has been covering “Complicated” by Avril Lavigne during all the stops of her Sour tour, but last night was different.