The singer made her track 'Part Of Me' available for her fans to stream online following her performance at last night's (February 12) Grammy Awards in Los Angeles.
'Part Of Me' is one of three new songs that will be included on Perry's forthcoming repackaged album Teenage Dream: The Complete Confection.
The set will be released on March 26 and will also include remixed versions of 'E.T.' with Kanye West and 'Last Friday Night' with Missy Elliot.
Speaking about her updated collection, Perry said: "This is the complete story of Teenage Dream. It was an incredible honour to tie the King of Pop's Billboard Hot 100 record, but I'm moving forward and had a few things left to get off my chest.
"So this is the complete special edition of my album for my fans."
'Part Of Me' is available to download in the US now and will be released in the UK in the coming weeks.
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Listen to Katy Perry's new single 'Part Of Me' below: