Miley Cyrus puffed away inside a Las Vegas nightclub with her legs spread open alongside Kellan Lutz -- and it was NOT HOT ... at all.
Cyrus partied her face off until the wee hours of the morning Saturday at Beacher's Madhouse and took a drag off some kind of rolled up paper ... it could be tobacco, but c'mon.
Lutz -- who denied he's dating Cyrus -- stood by while the singer got her smoke on ... but didn't seem too interested in Miley.
Wonder why?
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