Bradley Cooper and Suki Waterhouse made an appearance together walking the carpet at the Serpentine Gallery Summer Party at The Serpentine Gallery in London.

Suki looked hot in a sleeveless pink Burberry dress with a plunging neckline, a fact that Bradley knows by heart as he was spotted looking down his girlfriend's dress!

Waterhouse wore her designer dress with Topshop platform heels. Cooper looked fab as well in a dark navy suit over a light blue button-up dress shirt and no tie.

The event also saw the appearance of Gemma Arterton in a red ensemble. Presenter Alexa Chung went all black and was photographed with actress Keira Knightley and Cara Delevingne.

Lily Allen also attended and wore a short black shirt dress and blue Christian Louboutin heels.

The Serpentine is actually one of the more historic events that take place every summer for the past 14 years. It sends out invited to a leading architect to design a temporary Pavilion outside the gallery in Kensington Gardens. The design is unveiled at the annual Serpentine Gallery Summer Party, attended by the elite of the elite.

The architects that have been invited since 2000, included Ai Weiwei in 2012, Frank Gehry in 2008, and the late Oscar Niemeyer back in 2003. Sou Fujimoto was the invitee last year who drew in almost 200,000 people, one of the highest number of visits to the Pavilion to-date.

Smiljan Radic has designed this year's Serpentine Gallery Pavilion into a doughnut-shaped fibre glass shell resting on stacks of large rocks.

In the middle of the Royal Park of Kensington Gardens in central London, lays the Serpentine, which is actually comprises of two galleries situated on either side of The Serpentine lake.