From the makers of last year's Justin Bieber: Never Say Never comes this new pop tour doc about California Gurl Katy Perry, following the pop sensation as she embarks on a massive world tour.
It's a neatly packaged, good-looking affair which intersperses prep and performances from the tour itself with talking heads, past footage and, of course, interviews with the ever effervescent Perry herself.
"Everyone thinks she's a puppet, that her success came out of nowhere, but that's not the case at all," coos her loyal sister, who is also part of an entourage that genuinely all seem to get along.
Cue flashbacks of Perry's past, including the well-known - her Pentecostal background and her supportive but slightly scandalised minister parents, and the less well-known - she moved to L.A. in her teens.
There, she was dropped by not one, not two but three record labels before finally finding success and going on to become the first woman ever to achieve five number one singles from one album and only the second person in he world to do so after Michael Jackson.
Whatever you think of Perry's brand of bubblegum pop and cartoon costumes, this is not a success story even the hardest of hearts can begrudge.
Perry's innate likeability and charisma is the first of two things that make this documentary more watchable than it might otherwise be. The other is the ghost of Russell Brand.
Sometimes documentary makers just luck out, and in this case they have, at the very painful expense of the film's subject. The tour - and the cameramen - began within months of Perry's lavish wedding to the British comedian. By the time the tour and film are up, divorce is on its way.
Brand only pops up on a couple of occasions, and looks like a rabbit in headlights when he does (the comedian reportedly asked for footage with him in it to be edited out), but the lack of him casts a shadow.
It's clear whose side the film is on, as Perry flies back and forth to meet Brand wherever he is, before she finally succumbs to tears of exhaustion and heartbreak.
The one truly poignant moment of the whole film comes when Perry dons a robotic smile as she is ferried on to the stage, moments after a bout of hysterical crying. Would the film have worked without this perspective? Perhaps not.