Need help finding movie

ILovePoppy

sarNie Egg
I only remember that the OST had a part that said "Ok" and it was in the band's name. The movie was about a girl that was auditioning to be in some guys music video and there was this group of girls that dressed the same as eachother. i remember the main girl was a really good dancer and the singer of the movies theme was a guy with wavy black hair and was really cute.
 
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