The singer will release 'Wide Awake' as the final single from her Teenage Dream era on July 2.
The accompanying music video sees the star wrap filming on her 'California Gurls' music video before she is confronted with a dark labyrinth in her dressing room.
Perry is then greeted by a younger version of herself who helps her get through the trials and tribulations of the maze, which represents the star's turbulent two years.
The clip was supposed to premiere on MTV this evening (June 19), but has now been put online after it leaked yesterday afternoon (June 18).
'Wide Awake' serves as the official single for Perry's forthcoming concert movie Part of Me 3D, which will be in cinemas from July 5.
Watch the music video for Katy Perry's 'Wide Awake' below: