Paris Hilton -- UNBANNED From Las Vegas Hotel

Paris Hilton's war with Vegas titanSteve Wynn has apparently come to an end ... because she partied her face off at one of his nightclubs last night ... 15 months after she was banned from the property.

TMZ has obtained photos of Hilton getting down and dirty inside Surrender nightclub at Wynn's ultra-swanky Encore hotel in Vegas last night.

Paris had been blackballed from all things Wynn back in August 2010 -- after she was arrested for cocaine possession as she arrived to The Wynn hotel

Paris has since completed her legal obligations -- now, it seems she's made good with Wynn, too.