Sir Paul onstage as the crowds look on (Yui Mok/PA)
Sir Paul, at 80, is the oldest headline act in the 50 years of the festival, which started just as the constituent parts of The Beatles were beginning solo careers following their break-up.
The ex-Beatle had warmed up with a gig in nearby Frome on Friday with surprises apparently in store as audience members were asked to deactivate their phones to prevent any secrets leaking out before he arrived at Glastonbury.
Crowds at the festival have enjoyed an entertaining Saturday, with the likes of Noel Gallagher and Yungblud rocking the various stages.
Billy Nomates performing on the Left Field Stage (Ben Birchall/PA)
Earlier, a young couple said Love Me Do as former Beatle Sir Paul prepared to take to the Pyramid Stage on Saturday night.
Lara and Elliot Dayeh-Bunce had wanted to get married at Glastonbury but had to settle for renewing their recently-taken vows for legal reasons as Worthy Farm is not licensed for weddings.
Six weeks into wedlock, they renewed their solemn declaration at the Church at Glastonbury tent after a night’s revelry which saw them return to their own canvas home at 4.30am.
Kalush Orchestra, Eurovision winners from Ukraine, performing their first UK gig at Shangri-La’s Truth Stage, during the Glastonbury Festival (Yui Mok/PA)
Kalush Orchestra, Eurovision winners from Ukraine, performing their first UK gig at Shangri-La’s Truth Stage, during the Glastonbury Festival (Yui Mok/PA)