We can't get over how perfectly polished she looks, and it's giving us major style envy...
Rosie unleashed her inner screen siren at the swanky London bash and slipped into this stunning midi dress by BEC & BRIDGE that boasted a very dangerous looking criss-cross front, a cutesy polkadot print and cut-out detail on the sides.
Thankfully, self-confessed fashionista Rosie managed to avoid an embarrassing wardrobe malfunction and she pulled off the barely-there dress like a total pro while posing for the paps.
Reality starlets, take note!
Gorgeous Ms. Fortescue teamed her fancy frock with a pair of burgundy-perpex court heels and a lips-emblazoned clutch bag but it was her 50s-esque make-up look that drew the most gasps.
Of the good kind, duh!
Rosie lacquered her lips in Tom Ford's Velvet Cherry Lipstick, £38 and emphasised her already stunning peepers with lashings of the Tom Ford Ultra Length Mascara, £35 for extra impact.
The on-screen beauty joined pal Olivia Cox and her sister Lily but it's safe to say she blew everyone else out of the water.
Top marks from us, Rose!
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