Aside from holding in our tummies and trying not to make a faux pas like eating too many canapes, our rule number one is to don a killer dress, hold our head high and just, you know, be fabulous!
And Katherine did just that for the Melissa Odabash/Julien Macdonald collection launch at London's ME Hotel.
Looking super tanned and glossy, Katherine chose a swish turquoise silk wrap dress complete with black heels and matching handbag. Her make-up was simply and summery, while her signature blonde locks were teased to perfection.
Models, what models? We only have eyes for one girl.
Enjoy Katherine's style transformation in our gallery.