The famous actress appeared on The Graham Norton Show where she admitted being advised to say she was travelling for leisure and not work.
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Lawrence had made the trip from America to audition for X-Men: First Class but her passport was expiring soon.
Speaking on the show, she said: "They were like, 'Whatever you do, don't tell them that you're here for work, because they'll ask for a work visa; say you're here for pleasure.'"
"And I'm like, 'Oh my! Good God! I have to lie to a customs officer.'
The 25-year-old decided to say she was visiting for her brother's wedding.
"I get there and he's like, 'Business or pleasure?' 'Pleasure.'
"'What are you doing for pleasure?' 'My brother's getting married.' 'Where's your brother getting married?' 'Wimbledon.' 'Is he American?' 'Yes.'"
As this took several hours, J-Law was forced to wait in an airport jail.
"I had to sit in a tiny little jail for like five hours while they called my employer," she said. "I felt tiny."