11/07/2013 17:00 BST | Updated 22/05/2015 06:12 BST

Princess Style For The Biggest Party In London Last Night? Beatrice &Amp; Eugenie Go For DBDs (Demure Black Dresses)

Demure black dresses (aka DBDs) are a real thing this summer - especially for the likes of Princesses Beatrice and Eugenie who are well seasoned gala going ladies. Oh they know a sparkly soiree when they spy one and this week's Novak Djokovic Foundation inaugural dinner in London was exactly that.

The royals mixed with the glitterati (