GERARD BUTLER ROCKS OUT Manhattan Club With Help from Oasis [VIDEO] EXCLUSIVE (TMZ)

It hasn't been 2 months since Gerard Butler left rehab for substance abuse -- but last week, he was already back at an NYC bar, where he blew away the crowd with a knockout performance of "Wonderwall" ... and we got video!!!


READ MORE:  http://www.tmz.com/2012/04/12/gerard-butler-oasis-wonderwall-video/#.T4t-S6tSTiY