R&B singer Rihanna has surprised fans at the Desert Trip Festival in California when she joined the Beatles star Paul McCartney onstage for a rendition of their song "FourFiveSeconds" with rapper Kanye West. The 74-year-old veteran singer looked excited as he screamed, "we finally found someone under 50" after Rihanna came onstage, reported Entertainment Tonight. Rihanna dressed in an over-sized suit. Mary McCartney, Paul's eldest daughter, also took to Instagram to share few pictures from the concert.
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