Hardy co-hosted Melbourne's 3RRR radio show Best of the Brat on Tuesday nights from April 1996 to December 2007, under the pseudonym Holly C. The show was known as "the most immature show on Australian radio". Almost immediately following her departure from RRR, in January 2008 she began co-hosting the breakfast show on Triple J, the ABC's youth radio station, with Robbie Buck and Lindsay "The Doctor" McDougall. In December 2009, Hardy announced she was leaving Triple J to concentrate on her writing career.
Since 2008, Hardy has written 11 episodes of Packed to the Rafters, starting with the third episode of the first series. She has written episodes for every series up to the fourth.
Hardy formerly penned a blog called Reasons You Will Hate Me under the pseudonym "Ms Fits" which won a Bloggie award for Best Australia/New Zealand blog in 2008.