Olivia Rodrigo makes a surprise appearance during The Smashing Pumpkins’ headlining set at Lollapalooza in Chicago. Multiple reports say she performs a duet of “Thirty-Three” with the band, drawing attention from the festival crowd. The appearance occurs during the group’s Friday performance at the Chicago festival. Other guests also show up during the same set, including Melissa Auf der Mar and Yungblud, according to one outlet’s account. The reports collectively frame the appearance as an unannounced collaboration tied to the band’s live set rather than a separate event at the festival. While the sources focus on the specific song Rodrigo sings with The Smashing Pumpkins, they also note the wider context of additional surprise appearances during the headlining performance. No additional details are provided in the available coverage about how the collaboration is arranged or whether it affects upcoming releases or performances.