Paul Smith, Gabriela HearstJojo Korsh/BFA.com Gabriela Hearst and Sir Paul Smith took over the penthouse at Chateau Marmont to celebrate the launch of their limited-edition collaboration, drawing an eclectic crowd that included Jessica Alba, John Boyega, Edward Norton, Quinta Brunson, Michael Stipe, Diplo, Tom Parker Bowles, and Mamie Gummer. On paper, the Uruguayan designer and British fashion savant might make for an unlikely pair.