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Paris Hilton knows how to work it while walking through the airport ... even in casual clothes. Then again, if we were heading to Brazil, we'd be smiling, too!

The blonde heiress and her hunky boyfriend Cy Waits had their hands full while walking through LAX before boarding their plane to Rio.

While there, Paris will take part in a runway show for Triton Clothing Line. No doubt, her sexy tan will glisten on that catwalk. Loves it!