Paul McCartney
The Gerry And The Pacemakers frontman died on Sunday at the age of 78.
The Beatle also discussed a certain Taylor Swift secret sure to make any Swiftie jealous.
John's wife Yoko Ono also shared a video of New York's Empire State Building lit up in his honour.
The Late Late Show host took aim at the US president with the help of a Paul McCartney classic.
Taylor Swift, Paul McCartney, Diana Ross and Lana Del Rey were all due to perform at Worthy Farm in Somerset.
The former Beatles star will return to the iconic music festival next year to play for a second time.
The former Cream and Blind Faith player died on Sunday, his daughter confirmed.
The pair attended school together in Liverpool in the 1950s and had kept in touch over the years.
"It is scary these days," the former Beatles singer said of the incident.
As Once Upon A Time In Hollywood is watched by audiences, the GVO gang decided to have a quiz on past cameo appearances in film. Not sure Ash is very good at it though...