Kylie and Dannii's Purrrfect Duet

Kylie gave fans at her Showgirl tour in Melbourne a surprise last night (December 18) when she welcomed sister Dannii on stage.

"You've all waited a long time for this haven't you?" the tiny-tushed pop poppet smiled before the girls launched into a rendition of 'Kids' - Kylie's 2000 duet with Robbie Williams.

It was a sizzling performance according to fans, helped considerably by the girls' saucy outfits - as you can see here.

And backstage, Dannii hinted at a future musical collaboration with her big sis.

"When we were kids we'd dance around our bedroom singing into hairbrushes, so I guess we've had a lot of rehearsal leading up to this," she said.

"Kylie says in about twenty years we'll get an act together and work the Butlins holiday camp circuit."

Wonder if they'll still be rocking basques then or covering up in modest red coats...

SLJ