The pop star turned up for weekend two of the Californian festival

Rihanna joined Sir Paul McCartney during his set at the second weekend of Desert Trip last night (October 15).

The festival, which is organised by the team behind Coachella and takes place at the same location in Indio, California, has been dubbed “Oldchella” because its line-up features some of rock’s elders. Neil Young, The Rolling Stones, Bob Dylan, The Who and Pink Floyd‘s Roger Waters complete the bill.

As The Desert Sun reports, fans claim the former Beatle joked “We finally found someone under 50” as the pop star joined him to perform ‘FourFiveSeconds’. Watch footage from the performance below.

Neil Young joined McCartney on stage again, helping him perform ‘A Day In The Life’ and Plastic Ono Band’s ‘Give Peace A Chance’ for the second week in a row.

Earlier in the week (October 13), the Beatle played a tiny surprise gig for just 300 lucky fans.

The musician announced his impromptu performance at Pappy & Harriet’s, a small roadhouse venue in Pioneertown near to the California festival’s site, at 10am on the day. Tickets, priced at $50 (£40) each, were made available on a first come, first served basis.

McCartney’s 22-song set at Pappy & Harriet’s included Beatles, Wings and solo songs spanning his entire career. “We loved rocking at the Roadhouse! Small surprise gig in the desert (Pioneertown),” he wrote as he shared a picture on Instagram.