The Sports Illustrated Swimsuit team partied their butts off in Las Vegas last night -- as in, cigarette butts.
It all went down at Vanity in the Hard Rock Hotel where some of the hottest chicks in the world, including Bar Refaeli partied their faces off ... while sucking away on cancer stick after cancer stick ... after cancer stick.
Not all of the models needed to smoke to be smokin' hot -- cameras never spotted cover model Brooklyn Decker with a cig in her mouth once.
More Swimsuit Hotties
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