McCartney's Birthday Surprise: Grandchildren Record Their Own Version Of 'When I'm 64'

Paul McCartney's grandchildren have prepared a surprise for his birthday today, recording their own version of his song 'When I'm Sixty-Four'.

Recorded in the legendary Abbey Road studios - made famous by The Beatles in the 1960s - the song is believed to be the perfect way to put a smile back on his face, following his split from wife Heather Mills last month.

The surprise has been organised by daughters Mary and Stella. But McCartney's son James, as well as his adopted daughter Heather - from his late wife Linda's first marriage - have also helped with the song.

A close friend of the family told the Sunday Mirror: "The whole family are absolutely thrilled with the surprise. They know how down their dad has been recently and were desperate to think of the perfect pick-me-up to celebrate his big day. They wanted a money-can't-buy type of gift and were all just so thrilled when they hit upon this idea."

The family will play Paul their new version as a surprise when they gather at his £4 million estate in Peasmarsh, East Sussex, today for a barbecue party.