The billing also includes Tyler, the Creator, who was set to headline last year beforebowing out.
Rodrigo will be making her Lollapalooza debut, while Carpenter returns two years after headlining.
1 in the Billboard 200 and was his biggest first-week seller to date.
(L-R) Sabrina Carpenter, Olivia Rodrigo, Luke Combs and Tyler, The CreatorGetty/Luis Panch Perez
Ticket sales begins March 20.
Headliners there include Justin Timberlake, j-hope, Gracie Abrams, Raye, Benson Boone, Shaboozey and more.
