After Lollapalooza, Rodrigo wrapped her GUTS tour shows when she played Osheaga Festival in Montreal on Aug. 1 and 3. Meanwhile, Weezer will play festivals across the country in August, September and October before heading to South America in November for three shows.

On Thursday evening, Olivia Rodrigo made her debut at Lollapalooza Chicago and was joined by Weezer to perform their tracks, "Buddy Holly" and "Say It Ain’t So".

The pop vocalist also treated the Lolla crowd to her solo hits "Driver's License," "Traitor," "Love Is Embarrassing" and more. The festival continues into Sunday (August 3) with more headlining sets from Rüfüs Du Sol, TWICE, Sabrina Carpenter and A$AP Rocky.