The 23-year-old rising star was almost unrecognisable with her raven locks, wine-coloured lipstick and black sequinned gown.
Margot accessorised her rather gothic outfit with a multi-million dollar diamond necklace with matching earrings.
The young starlet was nervous before the awards ceremony, posting a picture of herself getting ready with the caption: “Never thought I’d say this … I’m getting ready for the Oscars!”