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It's not what you think! Even though she's getting $60 thousand a month in child support, Oksana Grigorieva isn't splurging at Bristol Farms -- she's buying groceries at Ralphs with the rest of us!

We snapped Mel Gibson's ex/baby mama at the grocery store in Sherman Oaks on Friday morning, and it seems like everything is working out well for her. No word on who's getting custody of little Lucia yet though...