According to the lawsuit, obtained by TMZ, Moira Fiore claims she was tapped to help Charlie find a new house, but there was a big problem -- she's only licensed to sell real estate in Florida and Charlie wanted a new crib in L.A.

So Moira says she engaged the services of uber-realtor Marty Trugman, who has repped a slew of celebs in Hollywood.

Moira says Marty promised to give her 25% of his commission as a referral fee. Charlie used Marty and bought a $6,999,999 house, but Marty never paid her a cent.

We spoke with Marty, who laughed and said, "I never promised her a referral fee. She didn't introduce me to Charlie. Brooke did."

Sources close to Charlie tell us he's pissed that -- unbeknownst to him -- Moira was "skimming the deal." Charlie is saying if Moira gets any money from Marty, it should go to him or his kids. - more on this story

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