Photo by Kevin Mazur/Getty Images for Desert TripFor the second weekend of Desert Trip, the star-studded music festival featuring several of rock’s all-time greats, Paul McCartney welcomed a special — and much younger –guest: Rihanna.

Clad in a pinstriped suit, Rihanna joined Sir Paul for his Saturday-night set in Indio, California. Together, they performed the song they released last year with Kanye West, “FourFiveSeconds.”

“We have finally found somebody under the age of 50!” the former Beatle joked, according to Billboard.

As was the case during the first weekend of Desert Trip, the other Saturday-night headliner, Neil Young, teamed up with McCartney on The Beatles’ “Day in the Life” and “Why Don’t We Do It in the Road,” as well as John Lennon‘s “Give Peace a Chance.”

Young’s set earlier in the night was different than the one he played the previous weekend, according to Billboard, inserting tunes like “Cowgirl in the Sand” and “Like a Hurricane.”

The Rolling Stones and Bob Dylan performed Friday night, while Roger Waters and The Who took the stage Sunday night.

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