The Miss Universe pageant goes down tonight in San Paulo, Brazil -- but the contestants got a head start on the swimsuit competition during a bikini show last week!

Women representing almost 90 countries from around the world showed off their beach bods during a preview presentation on Thursday, September 8.

The lovely ladies will be back in their swimwear tonight for the main event on NBC, judged by a panel including Helio Castroneves, Vivica Fox, Adrienne Maloof and Miss Universe 2003 Amelia Vega.

Representing USA will be Alyssa Campanella (above left). Do you think she has what it takes to nab the crown?

FYI: The last time America won was way back in 1997.

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