Ozzy Osbourne is urging fans to celebrate his 65th birthday on Tuesday (03Dec13) by donating money to Britain's Royal Marsden Cancer Charity.
The rocker officially becomes a pensioner in his native England on Tuesday and he has taken to Twitter.com to urge fans to give generously.
He tweets, "I'm using my bday (tomorrow) to raise money for @royalmarsden! Give a gift and donate to help cancer patients."
Ozzy isn't the only star to use his birthday to raise donations for the charity this year - former Spice Girls star Mel C, The Wanted stars Nathan Sykes and Max George and Sir Paul MCCartney have also urged fans to give cash to The Royal Marsden.