Australian diver Matthew Mitcham made quite a splash at a fund-raiser for marriage equality when he headlined at the Melbourne Cabaret Festival.

Mitcham opened the night performing on his ukulele and later surprised the crowd by performing a strip version of Aqua's Barbie Girl accompanied by the acclaimed harpist Tara Minton. Mitcham's contagious charm rubbed off on the other talented performers who weren't afraid to show a little flesh for charity.

Mitcham finished with a flourish, auctioning off his underwear for $1,000. Same Same has more info and photos.