It's a very, very special moment," Rodrigo told the crowd in Chicago's Grant Park on the second day of this year's fest. "I remember my first concert. It was a very memorable night. I watched this incredible band and I am so over the moon,

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.

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.