Avril never gets old.

you know how iconic you have to be to have the whole crowd singing every word of your song at someone else’s concert over a decade after you released it??? love avril

Olivia is a true 2000s kid! Bringing her favorite childhood singer on is so cool!

i love that new new girls are paying homage to the artists they grew up on. Billie elish brought Hayley Williams of Paramore on her coachella set, and now olivia bringing out Avril ❤ it’s also nice to see the previous generation is welcoming to the next one😭💖💖

Look how respectful Olivia is to Avril, she gave Avril the proper introduction. Let Avril sang the first part of the song before they did the duet. How can you not love Olivia.

Olivia Rodrigo is the great uniter of Gen Z and Millennials. Just the right amount of throwback but still fresh. This was rad.

This song is such an anthem. That whole crowd knows every word. They came to see Olivia and got the great surprise of seeing Avril. They were more than prepared to belt out her signature song.

Adorable how she shows her inner fan girl. In general I like how she shows her enthusiasm and emotions live.

I love how the crowd knew the words to Complicated still!! This is incredible!!

I can't believe this actually happened! Loved this song since I was a kid,, but ever since I went to Olivia's show and heard her cover, I've been listening to both versions nonstop! And now Olivia had a full duet with Avril, she looks so happy!!! I wish I was in this crowd, but I'm glad I at least saw Olivia live!

I love how the crowd didn’t know she was coming and still knew the song

This song came out when I was 15 and now I'm 33. Avril is one of my forever bands.

Olivia is so respectful

You can see the pure joy Olivia is experiencing

Rumor has it a few people recorded this on there phone......

I love when people show respect to the legends, the trailblazers, the ones who came before them and pave the way for the new ones to be who they are

I don't care what type of music you like. This looks like it was a lot of fun to be at. These ladies and that crowd are happy and having fun. just what we need right about now. This is better than a box of puppies.

Olivia’s has quickly become a master of working the crowd.. She handles herself so well, as we see here with Avril. As we saw with that boy whose hand she kissed in NYC and the prom queens with Gracie Abrams in Detroit -- plus blowing a kiss to that little girl. Grabbing phones and filming herself. Stopping concerts when she has perceived that someone in the audience needs help. Singing a duet so charmingly and affectionately with Conan Gray.

Olivia is from the 90s/2000s - travelled to present time to bring back the vibe and the Great time in music. ❤️

That drummer was having a blast with complicated ❤😂😊