Katy Perry says not working with Billie Eilish one of her biggest career mistakes(Photo Credit –Instagram)

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Singer Katy Perry admits that one of her biggest career mistakes was turning down the chance to work with “boring” Billie Eilish.

In 2016, the “E.T” singer was told by one of her friends to check Billie out but Katy was less than impressed at the time, reports Mirror.co.uk.

During a Q&A at a private event for Los Angeles based station KIIS-FM, Katy Perry opened up about the massive fail.

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