Shia LaBeouf Leaving Court After Arrest -- Regrets ... He Had A Few

Shia LaBeouf looked like crap as he left the courthouse Friday ... after being arrested for essentially going insane inside Studio 54 in NYC.

Shia had remorse and hangover written all over his face as he walked away, just having pled not guilty to criminal trespass and disorderly conduct.

Shia allegedly threatened cops, yelled obscenities at patrons inside the club and disrupted the performance. He also gabbed an ass or 2 during his drunken tirade.