Cara Delevingne has let her temper get the better of her once again.

The model and actress, who recently starred in the John Green adaptation “Paper Towns,” was fined before boarding a Eurostar train from Paris to London on Monday after she swore at security staff.

Delevingne, 23, acted like a “spoiled brat” and dropped F-bombs, according to onlookers, as she erupted in fury on her way from Paris to London for her sister Poppy’s birthday party, U.K. newspaper the Sun reported.

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Delevingne lost her cool when her luggage was pulled aside for a random check, according to the Sun. She swore at an officer and his colleague before dropping to her knees and pretending to pray so she would be allowed to board the train quickly.

The British actress, who is set to appear in “Suicide Squad” as Enchantress later this year, was held in an interrogation room for an hour after which she apologized for the disruptive incident.

The Eurostar is a high-speed train between the U.K. and France that goes through the Channel Tunnel.

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A representative for Delevingne did not immediately respond to TheWrap’s request for comment.

Delevingne became a social media sensation last year following a painfully awkward interview with “Good Day Sacramento” while promoting “Paper Towns.”

During the interview, Delevingne had a frosty back-and-forth with her interviewers from KMAX-TV. Asked whether she had read the John Green novel that the movie was based on, the actress — speaking via satellite from New York — shot back, “No, I never read the book or the script actually, I kind of winged it.”

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Quizzed on whether she had anything in common with her “Paper Towns” character, Margo, she replied, “No, I actually hate her.”

Eventually, one of the anchors brought the interview to a close, saying, “We’ll let you go then, how ’bout that? Why don’t you go take a little nap, maybe get a Red Bull?”