Prince Harry -- The Dripping Wet Party Video

Prince Harry's dancing might suck ... but he's one helluva diver -- as proven by this video of the royal spare partying his face off and jumping into a pool last weekend.

Harry was dancing -- and not well -- on the edge of a pool inside a Croatian nightclub when he decided to take the plunge. Another club goer jumped in right after him ... but Harry got out and started dancing again ... like nothing happened.