Robin Wined and Dined Our DCFS Social Worker

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Paula Patton just made an explosive claim in her raging custody war with Robin Thicke … taking the social worker charged with protecting their son to a fancy dinner.

Paula just filed docs — obtained by TMZ — alleging Robin and his attorney initiated a bunch of back-channel communication with the Department of Children and Family Services staff … including a dinner where Robin allegedly wined and dined a case worker. She’s even specific, claiming it was an expensive sushi dinner.

According to the docs … Paula’s also accusing Robin of…