One Direction's London premiere for their film 'This Is Us' took place Aug. 20, and the guests of honor and stars of the film presented a uniform, monochromatic front at the shindig.

They were joined by Simon Cowell, who put them together on the British 'X Factor,' as well as Little Mix, who are fellow 'X' alums and feature Zayn Malik's lady love (and possible fiancee) Perrie Edwards in their ranks.

Here's how the red carpet looked!

Sharp-dressed men presenting a united front in always stylish black on their big night.

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Flawless and coordinated.

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Simon Scowl... oops, we meant Cowell. Even though 1D line his pockets with cash, he's still rocking that signature scowl.

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The ladies of Little Mix -- three-fourths of the Mix, at least -- looked lovely. Say that five times fast. Leigh-Anne, Jade and Perrie were beautiful. Where's Jesy?

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Who hearts heartthrob Harry? Check out the print on his shirt.

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Lastly, the most important people in the 1D universe -- the Directioners!

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