For the last couple of years, the hot lads have stripped down to raise money for Sport Allies, a charity they created to battle homophobia in sport.
"I was delighted to be asked, and more than happy to help the boys with the amazing work they are doing through Sport Allies," McKellen said. "Though I did ask them to make clear on the invitation that I would remain clothed throughout the event."
If you are not familiar with these guys, here's a British chap to explain who they are ...