We can't get over how fierce she looks!
Katie joined pal Jessica Hayes, also launching a collection on the website, and looked a million dollars in a midnight blue, satin dress that boasted eye-wateringly high thigh-splits on either side, an incredibly plunging neckline and a hem that trailed behind her as she sauntered past the paparazzi.
Model Katie - who wore her raven tresses in effortless waves - teetered along in a pair of seriously high platform heels and she gave us all a major case of leg envy in the process, but thankfully she managed to avoid stumbling over as she made her way into the infamous venue.
Having turned her hand to fashion design, gorgeous Katie mentioned that her collection was created with us mere mortals in mind.
She captioned an Instagram snap of her posing in a racy lacy lingerie set from the line which launched this week, "I designed to empower all my independent sexy women out there. All shapes all sizes! Always be sassy!!!!!"
Katie rubbed shoulders with Olivia Buckland, Cally Jane Beech, Rachel Fenton and Ex On The Beach's Jemma Lucy at the bash.
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