Twilight star Charlie Bewley not only has the body of his dreamy vampire character Demetri, but the speed of a demon after winning the B.C. Cancer Foundation’s Underwear Affair 10 kilometre race on Saturday.

After last-minute plans to extend his Vancouver vacation, Bewley just happened to walk by the start of the event outside Rogers Arena that raises funds and awareness for cancers below the waist.

“I just rolled up about half and hour before we started with my two bags ready for L.A.,” Bewley said. “I just pulled out my training gear and checked my luggage.”

In a revealing orange-striped black brief number, Bewley had no problem running nearly nude. He completed the race in 37 minutes, ahead of 1,035 other runners.

“They’re surprisingly easy to run in,” he said. “As soon as you get permission to run in your undies, it’s very liberating.”

This is not Bewley’s first charitable running race in Vancouver. He raised $20,000 and completed an extended 64-km BMO Marathon last year (he ran a half marathon before the start of the full BMO Marathon) in memory of a friend who died of cancer.

Bewley also had won a past Underwear Affair race but was disqualified because he could not afford the $300 donation. He found this year’s coincidental stumble into the start line to be serendipitous.

Since Bewley joined the race at last minute, he plans to raise funds for the event by auctioning off his winning pair of briefs on Twitter.

The seventh annual Underwear Affair raised $633,000 for cancer research below the waist, which according to the B.C. Cancer Foundation, accounts for 48 per cent of all newly diagnosed cancer causes in the province.