It's believed Valentine netted around $10,000 from the sales.
A 19-year-old Perth woman has been guilty of creating and selling fake tickets for a number of live music events, including Listen Out music festival and Post Malone.
According to the ABC, Hannah Rebecca Valentine has been charged with "59 counts of gaining a benefit by fraud", as well as previously pleading guilty to 22 counts of the charge.
She has now pleaded guilty to an additional 28 counts and is yet to plea to a further nine charges.
It's believed Valentine netted around $10,000 from the sales, which had been sold through Facebook and Gumtree via multiple fake accounts since December 2017.
Mediation and reparations are reportedly underway for victims of the fraud, while Valentine is expected to be sentenced on 15 July.
The news comes just weeks after controversial online ticket resale platform Viagogo was found guilty of misleading consumers by the Australian Federal Court.
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Following a slew of public outcry and protests from artists in recent years, the Court has found Viagogo in breach of Australian Consumer Law, stating it made “false or misleading representations and engaged in conduct liable to mislead the public when reselling entertainment, music and live sport event tickets”.