Understated as ever, Alexa accessorised her look with a boxy wicker handbag, oversized sunglasses and a scarlet lipstick. Simple and completely doable.
While all eyes were on 'It girl' Alexa, yesterday's guests also included Tinie Tempah (he pitched up to DJ in a dapper white collarless shirt and cropped black chinos and slip-on plimsoles), model Jodie Kidd, and fashion designers Christopher Kane and Nicholas Kirkwood.
LOVE ALEXA'S 'IT GIRL' STYLE? Take a look through this gallery to see more stylish looks from the Brit beauty.
MORE! Catch up on all the latest from Alexa right here.