Katy Perry put on a racy display at her designer pal Jeremy Scott's documentary premiere on Tuesday (08.09.15) night.

The 30-year-old singer stole the show in a plunging black dress which showcased her famous assets as she provided support for Jeremy at the red carpet screening of The Vladar Company's 'Jeremy Scott: The People's Designer'.

Both Katy and Jeremy, 40, left their mark on Hollywood at a handprint ceremony outside TCL Chinese Theatre before the screening but Katy ensured she upstaged her friend with her daring low-cut frock, which was also slashed to mid-thigh.

She was lucky to get through the ceremony without a wardrobe malfunction as she leaned over to leave her handprints in the cement.

Dangling diamond earrings, heels, a bouffant hairstyle and dramatic make-up completed her look.

Katy appears in Jeremy's documentary as one of his celebrity muses and he loved showing their friendship behind the scenes.

Speaking about dressing Katy for her Super Bowl half-time performance and the Met Gala, he explained to WWD: ''There's a lot of people who know the iconic image of Katy Perry at the Super Bowl, but in this film, you see Katy and I in our car on the way to the Met and in the locker room bathroom before she goes on to the Super Bowl field. You get these behind-the-scene glimpses of what happened before all these moments.''