The Brit model who has a penchant for sharp fabrics and flat loafer shoes showed off her girly side at the party which drew in Anna Wintour and designer Diane Von Furstenbgerg.
We're just a little bit in love with the tiered detailing which was blanketed with teeny tiny blooms. So 70s chic, it hurts.
Alexa teamed her gorgeous, thigh-skimming number with a black, chain adorned shoulder bag and drew attention to the high-neck detail with her blunt cut bob which looks a little shorter and a shade lighter than usual - we like!
A seriously fierce pair of patent boots with a tough looking gold zip completed Alexa's timeless getup and she paraded her flawless pins while treating the cameras to a series of catwalk-worthy poses.
There's life in our summer dresses yet. Hooray!
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!