Katy Perry unveils Part of Me 3D trailer

The California Gurls singer has premiered the full promo video for her first documentary film.

is set to launch the documentary film this July giving fans the chance to see behind the scenes on her globe-trotting 2011 'California Dreams' world tour.

"Are you READY? SET? GO! The FIRST full trailer for #KP3D," tweeted the 27-year-old songstress last night tweeted.

The brand new promo trailer suggests parts of the film will address Katy's divorce from comedian husband Russell Brand, as well as a look at her life before making it big in the music industry, as well as discussing her strict Christian upbringing.

Katy Perry: Part Of Me 3D is expected to be released in cinemas in the US on 4th July weekend.

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