The festival affectionally known as “Oldchella” was jolted with a blast of youthful energy when Rihanna took the stage in Indio, California last night. During Paul McCartney’s headlining set at the second weekend of Desert Trip, RiRi made a surprise appearance to sing their 2015 collab “FourFiveSeconds.” “We finally found someone under the age of 50,” McCartney joked as Rihanna exited the stage after the song. Watch their performance below.