The reality babe decided to let her hair down at the star studded bash which drew in the likes of Desi Rascals' Jasmin Walia, CBB's Chloe Goodman and TOWIE's Frankie Essex to name but a few of her celebrity pals.
Steph who was all smiles throughout the evening, turned heads as she slipped into this very cool dress which boasted a feather splashed skirt and a satin bandeau with a sweetheart neckline.
Can we also just take a moment to marvel over her flawless legs? Thank you.
Stephanie proved her fashion credentials and teamed her show-stopping sartorial choice with a simple pair of strappy heeled sandals, her failsafe silver watch, a Chanel shoulder bag and a cute 90s-inspired elasticated choker.
We're digging ours back out, pronto!
Even though leggy Ms. Pratt attended the party without BFF Lucy Watson, that didn't stop her from having a blast and she even sat in the make-up chair to try on a few of Sleek's new lippies.
After opting for a bubblegum pink shade, Steph mingled with the guests and sipped on champagne until it was time to catch a cab back to Chelsea.
Yep. We'd LOVE to party with her.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!