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.” The performance took place at Massey Hall on Friday night, where Lavigne was the surprise guest. Both singers were in very on-brand plaid skirts, and Rodrigo (clearly a huge fan) greeted Lavigne with a big hug.