Katy Perry's new movie, Katy Perry: Part of Me - which follows a year or so in the life of the pop superstar, hit theaters on Thursday, and the concert documentary is proving to be a big hit with fans and critics alike.

The film opened to a mediocre $3.1 million on its first day, putting it on pace for about $12 million over the weekend, which was the film's budget.

But so far, Part of Me pales in comparison to concert docs in recent years from Justin Bieber and Miley Cyrus.

Bieber's Never Say Never (2011) raked in $29.5 million, and Miley's Hannah Montana / Miley Cyrus: Best of Both Worlds Concert Tour (2008) banked $31.1 million (and played in roughly 1/5 of the theaters that Never Say Never did).

Movie review site Rotten Tomatoes gives the film a 78% approval rating. Here's a sampling of what the critics are saying...

A- "There are a lot of things to love about Katy Perry"
- Owen Gleiberman, ENTERTAINMENT WEEKLY

3 Stars "A backstage pass that even non-fans will enjoy."
- Alynda Wheat, PEOPLE MAGAZINE

“A Fascinating glimpse at an Inspiring story”
- Mara Reinstein, US WEEKLY

"I loved it! I was already a Katy Perry fan, and the movie just made me love her more."
- Vickie An, Time for Kids

 “Irresistible, intimate, revealing, inspiring and uplifting!” & “Katy Perry: Part of Me” is a blast! So much fun!”
- Scott Matz, Access Hollywood

“A Teenage Dream come true!” & “Intimately revealing
- Kate Walsh, In Touch

“An unflinching honest look into the real Katy Perry” & “Entertaining, but equally deep and inspiring. It’s not just cotton candy.”
- Perez Hilton, PerezHilton

"The summer's best movie”
- Chloe Melas, Hollywood Life

“‘Katy Perry: The Movie’ is genuinely inspiring…It’s fun for the entire family”
- Drew McWeeny, HitFix

"Spectacular"
- Joel Amos, MovieFanatic

“This movie will inspire girls everywhere to dream big!”
- Shanee Edwards, SheKnows

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