The annual event held at the Serpentine Gallery is one of the best occasions for seeing celebrities in the latest resort fashion. The outdoors effect featured plenty of star power, along with some excellent looks.

See the best dressed celebrities at the Serpentine Gallery Summer Party 2014 and find out who designed their gorgeous outfits. While the men mostly wore Brioni, the ladies really pulled out all the stops for the party.

Keira Knightley

The British actress wore a stunning Chanel dress from the French fashion house’s Resort 2015 collection. Knightley is definitely among the Serpentine Gallery Summer Party 2014 best dressed celebrities, even though she took a big risk by pairing the multi-colored dress with white linen trousers.

Keira Knightley Serpetine Party Outfit

Naomi Campbell

Naomi Campbell Serpetine Party Outfit

One of the biggest supermodels of the ‘90s made a splash at the Serpentine Gallery Summer Party wearing Givenchy. Naomi Campbell opted for a sequined red dress from the Givenchy Pre-Fall 2014 collection. The asymmetrical dress was matched with a bold lips for a gorgeous look.

Princess Beatrice

Princess Beatrice Serpetine Party Outfit

Famous for the Philip Treacy fascinator she wore at the 2011 Royal Wedding, Princess Beatrice chose a Nicholas Oakwell Spring 2014 Couture dress, but didn’t pair it with a hat, just a bouffant ponytail. The tea-length dress with floral appliques was accessorized with lilac pumps and a green clutch for a gorgeous effect, making her one of the Serpentine Gallery Summer Party 2014 best dressed celebs.

More: Almost Naked! Most Outrageous Celebrity Dresses

Princess Eugenie

Princess Eugenie Serpetine Party Outfit

Princess Beatrice’s younger sister, also known for her Royal Wedding fascinator, opted for a blue Burberry London dress. While the dress looks simple from the front, the back detailing is perfect for an elegant summer party and the young royal completed her look with Nicholas Kirkwood shoes in white and nude, and a studded clutch.

Cara Delevingne

Cara Delevingne Serpetine Party Outfit

Model Cara Delevingne was also one of the Serpentine Gallery Summer Party 2014 best dressed celebrities. As the face of the Mulberry Fall 2014 campaign, Delevingne chose to represent the brand in a black column dress with no sleeves, and paired it with the eponymous bag Mulberry created using Cara as the inspiration.

Gemma Arterton

Gemma Arterton Serpetine Party Outfit

English actress Gemma Arterton wore a daring red ensemble at the the annual Serpentine Gallery Summer Party. The crop top and asymmetrical tulip skirt were both from the Prabal Gurung Resort 2015 collection, and the actress took her look to the extreme in a good way with red patent sandals.

See also: Amazing Red Carpet Looks from Cannes 2014

Arizona Muse

Arizona Muse Serpetine Party Outfit

Definitely among the Serpentine Gallery Summer Party 2014 best dressed, model Arizona Muse wore a nude Emilio Pucci Fall 2014 dress. The gold chain detailing and her cool twisted updo were a modern interpretation of the Grecian goddess look.

Samantha Barks

Samantha Barks Serpetine Party Outfit

British actress Samantha Barks chose Lanvin for the the annual Serpentine Gallery Summer Party. Her metallic pink dress was part of the Spring 2014 collection. Going for the trendy matchy-matchy look, Barks kept her shoes and earrings in the same tonal family, pulling off a cohesive look that’s almost too elegant for a summer outdoors event.

Alexa Chung

Alexa Chung Serpetine Party Outfit

English television presenter, model and contributing editor at British Vogue Alexa Chung was also among the Serpentine Gallery Summer Party 2014 best dressed stars. She wore an Erdem Fall 2014 dress. The black velvet, strapless creation may not have been the best look for summer, but the British beauty pulled it off with a bold lip.

Suki Waterhouse

Suki Waterhouse Serpetine Party Outfit

Model Suki Waterhouse attended the summer party with boyfriend Bradley Cooper. While he chose a Rioni black suit with a grey shirt, Suki chose a pale pink creation from the Burberry Prorsum Fall 2014 collection, making a daring choice by pairing it with blue and white Topshop sandals.

Pharrell Williams

Pharrell Williams Serpetine Party Outfit

Among the Serpentine Gallery Summer Party 2014 best dressed, Pharrell left his iconic hats behind and went for a most subtle look. The singer gave a surprise performance at the London event, and he was one of the best dressed men at the party, pairing a Brioni blazer with Levi jeans and a white tee, along with black sneakers.