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- Winner: Kristen Dalton
- Air date: April 19, 2009
- Network: NBC
- Crown value: $202,000AP: 51 Miss USA Contestants Compete... (April 19, 2009)
- Location: Las Vegas, Nevada
- Venue: Planet Hollywood Resort
- Part of NBC Green Week
- 51 Contestants
- Competitions: Swimsuit, evening gown and talent
- 2008 winner: Crystle Stewart
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Kristen Dalton was crowned Miss USA on April 19, 2009. The event was held in Las Vegas, Nevada at the Planet Hollywood Resort. The program was produced by Donald Trump and hosted by Billy Bush and Nadine Valazquez. The winner of the $202,000 crown also received a scholarship to the New York Film Academy and a salary for the year of her reign.