The duo, who Usmagazine.com sources witnessed making out more than once, were perhaps feeling loose and lovey due to the marijuana they were openly smoking at the club. As the 4 Non Blondes song "What's Up" played in the background, Hilton sang along, replacing the chorus' "what's going on" lyric with "let's smoke a bowl!"
Though they were cuddly inside, Hilton and Adler left at 2:30 a.m. in different cars.
The night of debauchery comes just a month after Hilton brazenly told Larry King that she's never done drugs.
Hilton's rep Michael Sitrick tells Usmagazine.com, "Paris absolutely did not smoke pot Tuesday night or Wednesday morning, as I understand was reported. That report is false."
The rep doesn't, however, deny her, uh, lip-locking with Cisco Adler. "She was with Cisco Tuesday night/Wednesday morning," he says.