Rihanna -- Shocks 'Oldchella' Crowd ... Sings With Paul McCartney (VIDEO)
Rihanna surprised everyone at Paul McCartney's desert show Saturday night ... joining him onstage for their hit song 'FourFiveSeconds.' Paul was in the middle of his set during weekend 2 of the Desert Trip Festival outside of L.A. when RiRi entered…
TMZ — Rihanna surprised everyone at Paul McCartney's desert show Saturday night ... joining him onstage for their hit song 'FourFiveSeconds.' Paul was in the middle of his set ... more info