The Love Island presenter oozed so much cool as she walked the plush black carpet alongside a string of celebrity guests but she didn't get swept up in the glamour - oh no.
Caroline - who took to the decks at the bash - ditched the floor length frocks and sky-high heels and tapped into the underwear-as-outerwear trends as she made a huge splash in this slinky khaki slip dress that boasted 90s-inspired spaghetti straps and a gothic lace trim around both the neckline and hem.
Kim Kardashian, eat your heart out!
Never one to blend into the crowd, fabulous Ms. Flack - who was joined by Lucy Mecklenburgh, model Hailey Baldwin and singer Ella Eyre - unleashed her grunge side and donned a pair of chunky biker boots that drew attention to her seamless pins (he-llo, glow!).
Giving her straighteners the elbow, Cazza rocked her stunning ombre locks in tight tousles and she gave us all heaps and heaps of make-up envy with a smokey cat-eye and lashings of shimmer-flecked bronzer.
Elsewhere in the city, Love Island's Olivia Buckland (who just announced her collaboration with Quiz clothing live on Reveal's Facebook page) and ex Made In Chelsea star Lucy Watson made waves at the Cosmopolitan Fash Fest, while Frankie Gaff and Strictly's Georgia May Foote rocked up to the V by Very Fashion Week party.
A star studded night all round, right?
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