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American Eagle just proved sex sells -- even when it stirs up drama.

The company announced Wednesday its campaign with "Euphoria" star Sydney Sweeney has been its best advertising effort to date, helping the brand smash Wall Street expectations for the second quarter. Getty

Earnings per share came in at 45 cents — more than double the 21 cents analysts predicted — while revenue hit $1.28 billion. Net income clocked in at $77.6 million, up from $77.3 million a year ago. Shares spiked more than 20% in after-hours trading on the news.

TMZ has learned foot traffic in the company's stores has jumped 5% after Sydney's campaign went live July 23 ... with denim sellouts and her custom Sydney Jean vanishing in a day.

The ads, splashed with the cheeky slogan "Sydney Sweeney has g

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