'Teenage Dream' superstar Katy Perry has shared the fourth teaser clip for her upcoming new single 'Roar' and it shows her in the recording studio putting on headphones and preparing to lay down vocals.

In this new video, she can be seen wearing the embroidered jacket that features on the song's official artwork (pictured below) and shows off a fresh-faced look that is framed with a burst of dark lipstick.

A longer portion of the track can also be heard this time around as the trailer is 45 seconds in length. 'Roar' will premiere on Monday, August 12 and Perry is still promoting her new album, 'Prism, with a large golden truck that is currently driving across the USA.

She took to her Twitter page earlier today and revealed the lorry's next destination: "Pssst: The #PRISM truck will be at the biggest waterfall in the USA at 8am! You know the one!"

'Prism' is due to drop later this autumn on October 22.