Kesha was once the biggest pop girl here for a hot minute back in 2010. She's still relevant though which is kinda funny because she hasn't released anything since 2013.

But her singles still get a lot of recurrent airplay and when they talk about celebrities being on the show they usually include "It's Kesha!" in with other big musical acts.
P!nk is still Queen of Australia though. I heard "Bad Influence" on the radio the other day. Mega bop.