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Mossimo Giannulli 's working through the end of his marriage the Beverly Hills way ... he's picking up some sweet duds on a day out with a young woman at his side ... but he says it's not what you're thinking.

The fashion designer stepped out in BH on Thursday -- mere hours before news of his split from Lori Loughlin broke -- and he was spotted at the valet of a shopping center picking up his car. Backgrid

Mossimo tells us ... he was doing a photoshoot for his golf brand, G/FORE, yesterday -- and the woman at his side is his stylist. There is NOTHING romantic going on between them.

Giannulli's dressed casually in a white polo shirt and blue jeans ... and he's chatting casually with a woman in a blue sweater and a tiny, tan skirt with a desig

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