David Cassidy SUED — C’Mon, Get to Paying Your Giant Bill

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The Partridge Family” star David Cassidy is learning the hard way … it”s never a good idea to stiff your lawyers, no matter how dreamy you are (allegedly) … because they”ll sue your bell-bottom pants off.

David — aka the Justin Bieber of his day — is being sued by Rodier & Rodier law firm, which claims David racked up $134,221.50 worth of legal bills from 2006 to 2011 … but never fully paid them off.

In fact, the lawyers say the former teen idol has only coughed up $25,000 to date — and now they”re asking the court to force David to fork over the remaining $109,221.50 … plus interest.

A rep for David tells our sources … “There seems to have been a misunderstanding between them which I believe will be amicably resolved.”

We”re guessing with a check.