Billboard #1 Hit Wonders of the 2010s (Part 2) by CourtneyKhaaaaaan

Question 5

Everyone knows that Olivia Newton-John, Helen Reddy and Kylie Minogue brought Aussie pop to the charts in the 70s and 80s but there's been a lull in the new millennium. Only TWO AUSTRALIAN WOMEN have made it to the top in the last 20 years. One with a powerful voice singing about not needing Cheap Thrills. The other raps about being Fancy with Charli XCX. Name both these women. (TWO ANSWERS REQUIRED)

Sia, Iggy Azalea