PAUL McCartney has been named as a surprising addition to the cast of one of Hollywood’s most successful movie franchises.

The Sun reports that the former Beatle, 73, will star alongside Johnny Depp

in the fifth instalment of the hit franchise, titled Dead Men Tell No Tales.

Film bosses are keeping his part a closely-guarded secret.

But insiders claim a huge set is being built around the singer, indicating the part is more than a cameo.

It is believed McCartney’s close friendship with Depp, who plays Captain Jack Sparrow, led to his involvement.

A source close to the music legend said: “Macca’s a huge fan of the Pirates of the Caribbean movies and couldn’t turn down the chance to be involved.”

Depp, 52, starred in Sir Paul’s video for his 2013 single Queenie Eye.

Rolling Stone Keith Richards, 72, played Sparrow’s dad in Pirates No 4, On Stranger Tides in 2011.

McCartney has tended to play himself in the past, including in A Hard Day’s Night and Help! The movie Dead Men Tell No Tales is out next year.

This story originally appeared in The Sun