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She was once a child star.

Was. But Transportation Security Administration officers didn't realize that "Harry Potter" actress Emma Watson is now grown up.

TSA agents recently stopped the 22-year-old as she flew into JFK airport when they mistook her for an unaccompanied minor.

According to a report in the New York Daily News, Watson tweeted about the incident, which occurred around the holidays.

"Passport control: 'Unaccompanied minor?' Me: 'Sorry?'" Watson tweeted.

"Passport control: 'Where is ur (your) guardian?' Me: 'I'm 22!!!!!!'"

Typically, anyone 12 or under is required to be accompanied by an adult at an airport.

Watson, who is British and a regular magazine cover girl, seemed more amused than annoyed by the incident. "Never wearing a backpack again," she tweeted.

And apparently, she's already been through it before. "The really sad thing is that this is not the first time this has happened," she tweeted.

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