The Wolf of Wall Street actress was snapped catching a flight at LAX on 3 March looking as gorgeous as always in jeans and a trench coat.
Margot, 23, shot to global fame as the blonde bombshell wife of Leonardo DiCaprio in Wolf of Wall Street, so we still do a double take when we see her newly-dyed brunette locks.
The star made the dramatic switch for her role in upcoming movie Z for Zachariah, which is currently filming in New Zealand.
Z for Zachariah is a post-apocalyptic science fiction movie co-starring Chris Pine and Chiwetel Ejiofor, who was nominated for an Oscar for his work in 12 Years A Slave.
Margot was at the Oscars ceremony on Sunday night to support Wolf of Wall Street, which had been up for the 'Best Picture' gong, and her co-star Leo, who was nominated in the 'Best Actor' category.
Unfortunately, the movie lost out to 12 Years A Slave and Leonardo was beaten by Matthew McConaughey, who starred in Dallas Buyers Club.
Nevertheless, it seems like it was a memorable night for Margot, who had tweeted before the show: "Never thought I'd say this.. I'm getting ready for the #oscars!!!!! (sic)"
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Full red carpet gallery from Oscars 2014 below:
Copyright: Rex Features Startraks Photo