The video, which can be watched now below, opens with Perry plummeting to Earth as a blue alien creature.

The singer then transforms into a gold warrior character who comes across a robot.

The robot then comes alive as Kanye West.

'ET' is the fourth single to be taken from Katy Perry's 'Teenage Dream' album which also features collaborations with Snoop Dogg.

Katy Perry is currently on the UK leg of her 'California Dreams' world tour.

Katy Perry - 'ET' (featuring Katy Perry and Kanye West):

(by Holly Frith)