Last night the stars were out in force for The Serpentine Summer Party in Kensington Gardens in London. The great and the good of the fashion world, from Kate Moss to Sienna Miller and Ellie Goulding were on seriously glamorous form for the night with slip dresses, sequins and plunging necklines trending.

Also in London, Kate Middleton attended The Art Fund Prize at The National History Museum, channeling the off-the-shoulder trend in a sleek jersey dress by Brazilian-born designer Barbara Casasola.

Meanwhile in Paris, Olivia Palermo, Mila Jovovich and Zoe Kravitz were front row-ready at Valentino's latest Couture show, wearing standout pieces from the forthcoming Autumn Winter 2016 collection.

Check out all of the best looks of the week in the gallery below.

From Kate Moss to Sienna Miller: this week's fashion highlights