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Millie Bobby Brown proved she's not afraid to stand up for herself.

While Brown posed on the red carpet at a screening of Season 5 of "Stranger Things" in London Nov. 13, photographers shouted at the 21-year-old actress to smile.

She fired back, "Smile? You smile!" before walking off.

The "Enola Holmes" star stunned at the event in a strapless corset dress. She paired the look with sheer black tights, black shoes, dainty rings and dangling earrings.

AMAL CLOONEY, HEIDI AND LENI KLUM TURN HEADS AT THE VENICE FILM FESTIVAL

Brown opted for a subtle makeup look and wore her long brunette locks in a center part, pinning back the front pieces while the rest flowed down her back.

WATCH: MILLIE BOBBY BROWN STANDS UP TO PHOTOGRA

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