Photo of Paul McCartney with Rihanna, by MJ Kim/MPL Communications Ltd/Getty

While Desert Trip (aka Oldchella) has already proven to satisfy old and young fans alike, Paul McCartney stepped up his game on Saturday night with a guest appearance from Rihanna.

The singer joined him on stage last night in Indio for a live rendition of their Kanye West collaboration "FourFiveSeconds," sans Kanye West.

Watch fan footage below.