Katy Perry Says It Was A ‘Mistake’ To Pass On Working With Billie Eilish

Katy Perry Reveals Her 'Big Mistake' With Billie Eilish

Katy Perry says she made a 'big mistake' passing on collaboration with Billie Eilish

Katy Perry Reflects on ‘Huge’ Mistake of Passing on Opportunity to Work With Billie Eilish