Call the R$PCA: Sia, Ke$ha, Dr Luke and possibly a dog are in the studio together

Working her way through pop's great and good, Sia is now col­lab­or­at­ing with street-squatting singer of song Ke$ha.

The pair were pho­to­graphed in the studio and the pho­to­graph, a possible future entry for Viz's Up The Arse Corner, was tweeted to the world by Sia with the caption: "Two girls are better than one."

Dr Luke was included on the tweet so one can only assumed he's milling about somewhere too, making the whole thing really quite exciting indeed.

Sia also asked Ke$ha: "Shall I bring you a dog or what?" but we're not sure what's that's about. Poor dog.