To achieve Katy’s creamy, old school starlet complexion you’ll require a good powder compact like Perfect Glow Compact Powder By Terry. It is lightweight and translucent providing a matte finish that will last throughout the day. You can re-apply when required – just tell your mates that you’re off to the powder room - and to gain added mystique use Pout’s Rouge on the apples of your cheeks for a light flush of pink.

Katy’s perfect eyebrows can be achieved with Benefit’s Speed Brow to smooth, tame and tint your unruly brows. Simply sweep across the brow in one swoop and wait for it to dry. Paul & Joe’s Lash Mascara will give you long luscious lashes to flutter at the boys (or girls). To emphasise the 50s pin-up element of your look use Playboy’s Lip Gloss in Nude, which has a super cute Playboy bunny on top.

To be a star you need to smell the part – we recommend a spritz of Chloe’s Eau De Parfum – an alluring feminine and floral fragrance that comes in a classic and chic bottle. Bright nail polishes are big this season, but to add a touch of dark glamour, paint your pinkys with Barry M’s Nail Paint in Black. Katy often sports beautifully curled tresses, so for ultra shine and hold use Bedhead’s Extreme Curl Mousse. Work through the hair and style as desired. Finally complement your sex siren look with a cute (and incredibly on trend) bow headpiece like Topshop’s star print band.