Hilary Duff — Paparazzo Goes Down … HARD!

EVERYBODY loves watching people fall down … even Hilary Duff … who couldn”t help but smile last night when a paparazzo lost his footing and ate it HARD … and it was all caught on tape.

Duff was leaving Aventine in Hollywood when an overzealous and underbalanced photog tried to get in position for a shot … and wound up flat on his back.

You gotta see Hilary”s post-fall commentary, which included gems like … “exciting” and “pretty awesome.”

She”s right.