Most stylish stars at Once Upon a Time in Hollywood UK premiere

Margot Robbie wears burnt orange gown by Oscar de la Renta

Hollywood’s greatest and glitziest gathered in London on Tuesday evening to celebrate the UK premiere for Once Upon a Time in Hollywood.

Cast members including Margot Robbie, Leonardo DiCaprio and Brad Pitt posed together on the red carpet, looking every part the glamorous Hollywood trio that they are.

Robbie chose a burn orange Grecian-inspired gown by Oscar de la Renta for the evening, while DiCaprio and Pitt arrived looking suited and booted in black ensembles.

Elsewhere, Girls actor and writer Lena Dunham packed a punch in her red carpet look: a custom 16Arlington gown that featured billowing orange and crimson plumes.

Several British stars were in attendance too, including actors Damian Lewis and Simon Pegg and model Lottie Moss, whose black PVC gown offered a sophisticated twist on the humble bin bag.

The critically acclaimed film by Quentin Tarantino, who was also in attendance on Tuesday, is already out in the US and will arrive in British cinemas on 14 August.

The UK premiere comes one week after the equally starry Los Angeles premiere, at which Robbie wore a white floor-length gown by Chanel.

Click through our gallery above to see the best-dressed celebrities at the UK premiere for Once Upon a Time in Hollywood.