Zac Efron gets hot and heavy with Nicole Kidman in his new flick -- and he does it while soaking wet in his tighty-whities!

The first trailer for their latest movie, "The Paperboy," dropped online this morning and it's one sexy-looking film.

Efron and Matthew McConaughey star as brothers who investigate a murder to exonerate a man on death row, played by John Cusack. It gets complicated though when Efron's character starts up an affair with the man's fiancee.

The trailer gives us some great looks at Nicole vamping it up as the sultry Charlotte ... and even better shots of Efron and his impressive body.

The movie opens October 5.

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