Members of the Hollywood elite, including Bradley Cooper, Orlando Bloom and Keira Knightley, mingled with royals and rock stars at the annual Serpentine Gallery Summer Party in London on Tuesday night (01Jul14). Famous faces from the world of film, fashion and music mixed with royals including Princess Beatrice and Princess Eugenie at the lavish bash, which is held every year in Kensington Gardens to mark the unveiling of the new pavilion design. Pharrell Williams performed during the event, thrilling the crowd with hits including Happy and his Robin Thicke collaboration Blurred Lines, while guests rubbed shoulders with music stars including pop singer Lily Allen and former Oasis rocker Noel Gallagher. Models Naomi Campbell and Cara Delevingne were also in attendance, along with Hollywood stars Cooper, Bloom and Knightley, who was with her rocker husband James Righton. Cooper attended with his model/actress partner Suki Waterhouse. Other famous faces at the bash included actress/singer Samantha Barks and TV star/model Alexa Chung.