Getty CompositeSofia Richie has a bun in the oven -- something people have suspected for a while now ... and which she just confirmed with a big, splashy magazine cover story.
The model/socialite made the announcement Thursday courtesy of Vogue -- which posted a bunch of maternity shoots pics that were taken by a professional photog ... showing off Sofia's growing belly, not to mention of a bunch of fashionable outfits to boot.
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