Steven Spielberg -- Holy Crap! Is that Spielberg Hittin' a Pipe on 4/20?!??!!!

So riddle us this ... if it looks like Steven Spielberg, tokes like Steven Spielberg, and claims to BE Steven Spielberg puffin' away at the Cannabis Cup on 4/20 ... is it Steven Spielberg?

The annual celebration took place in Colorado and the guy who shot the video says Stoneyberg told everyone he WAS the famous director -- so potheads were hooking him up with free dabs.

And then there's this tidbit ... Spielberg's wife Kate Capshaw was at Coachella.

Sadly ... no midlife here. A rep tells us it's not S.S.