The veteran R&B act ran through two of their most iconic hits with the "Espresso" singer on Sunday night (Aug. 3) in Chicago.

On the final night of Lollapalooza, one of the festival's biggest headliners brought out music legends to help the crowd just "let loose and groove."

Among the big draws were Sabrina Carpenter, who closed out the festival with surprise guests Earth, Wind & Fire, and A$AP Rocky, who performed from a life-sized helicopter onstage. The Marías, Dominic Fike, and Finneas were among the highlights from the Chicago fest’s final day on Sunday at Grant Park.