Casper Smart J. Lo's Ex Proves He's ... KNOT Afraid of Change

7/16/2014 12:20 AM PDT

Casper Smart's post-Jennifer Lopez life may have fewer champagne wishes and caviar dreams ... but dude can still afford a (sorta) fancy new hair style.

Smart went full Asian on Tuesday ... strolling out of Philippe Chow while rocking a mean Samurai-styled topknot.

Casper was pretty talkative too -- giving us his pro-dancer review of J.Lo's recent twerkfest in Miami, but more importantly ... he told us what the hell he was thinking when he got his hair chopped. 

Then again ... that cut might be self-inflicted.