Katy Perry has unveiled the trailer for her upcoming music video, 'Last Friday Night (T.G.I.F)'. 

She has previously teased fans by releasing a series of photo stills that pictured her in full 80's get up, from Day-Glo coloured clothes and earrings, to train track braces and a fabulous crimped hairstyle, but this new clip goes one step further. 

A hungover and confused Perry is shown vomiting into a rollerskate and drunkenly flashing her breast much to the excitement of a fellow party goer. Watch the full trailer ahead of the video's preview on June 14, here: