Schwarzenegger's Kid -- Cops Shut Down House Party

Law enforcement sources tell TMZ ... cops received six noise complaints about a house party in West L.A. on Saturday night ... and when they arrived to the scene, they were greeted by Patrick Schwarzenegger.

We're told the officers -- which included members of an LAPD Vice Unit -- informed Patrick about the complaint -- and asked him and the other co-hosts to call it a night.

Sources tell us Schwarzenegger and his pals were very nice and complied -- but we're told the officers handed out multiple citations to minors who were in possession of alcohol.

We're told Patrick was not among those cited.