The band played its own set on the main stage before joining the "Back to Friends" singer later on.
Luke Hemmings of 5 Seconds of Summer at Lollapalooza 2026 held at Grant Park on July 30, 2026, in Chicago.
Victoria Sanders/Rolling Stone
5 Seconds of Summer looked so perfect standing there at Lollapalooza, where the pop-rock band joined sombr on stage as well as covered a Katy Perry classic during its own set.
In clips captured by Billboard from the first day of the Chicago festival on Thursday (July 30), bandmates Luke Hemmings, Michael Clifford, Calum Hood and Ashton Irwin provide backup for the “Back to Friends” vocalist as he put his own vocal spin on “She Looks So Perfect,” 5SOS’ breakout 2014 hit that peaked at No. 24 on the Billboard Hot 100.
