It turns out that it was the borderline iconic (and delightfully bargain) shade of essie polish: Ballet Slippers.
"Emma is sporting a custom Louis Vuitton maroon pantsuit for this evening's red carpet. This outfit called for a classy, glamorous nail to offset her androgynous look," celebrity manicurist Emi Kudo told E News. "Essie's sheer, pale pink Ballet Slippers was the picture-perfect choice, finishing with essie's gel.setter for added gel-like shine."
The product is a seriously popular one, with fans including the Queen and Kate Middleton.
The best part is that it will only set you back $15. How's that for A-list beauty on a budget.
This article originally appeared on Womens' Health.