The film is fucking terrible; I don't think even my niece was massively impressed despite saying she "liked it". Katy comes across as a deeply irritating, kooky, vain and self important bore. Her break-up with Russell Brand occurred towards the end of her year long Californian Dreams Tour, presumably the year apart allowed him the time to come to his senses and realise that his life would be much improved without a zany annoyance for a wife.
Also, I appreciate that Katy Perry has a hugely successful music career and countless fans but it does seem a little arrogant to make such a self serving music biopic about yourself.
Another film with a music theme running through it, that just about stays on the right side of kooky retro, is Electrick Children. A couple of teenagers leave their repressive Mormon community and hook up with a group of Las Vegas skate punks. It's an agreeable if forgettable coming of age drama, that is perhaps a little too understated and slow for its own good.
Katy Perry: Part of Me is out in cinemas now; Electrick Children can be seen from Friday 13th July.