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Paul McCartney's second Desert Trip gig featured an unexpected guest as the singer welcomed Rihanna to the stage to perform their joint "FourFiveSeconds."

"We finally found someone under the age of 50," McCartney joked as Rihanna exited the stage following the performance, making light of the Desert Trip demographic.

"FourFiveSeconds," also co-written by Kanye West, has been a mainstay in both Rihanna and Paul McCartney's set lists since the single's arrival in January 2015. McCartney and Rihanna's "FourFiveSeconds" duet at Desert Trip marked the first time the singers had performed the track together since the 2015 Grammy Awards.

Like McCartney's Desert Trip set on October 8th, Neil Young, his partner on the Saturday night bill, again joined the Beatle onstage to perform "A Day in the Life" mashed up with John Lennon's "Give Peace a Chance" as well as the "White Album" rocker "Why Don't We Do It in the Road?"