Posh's cutest accessory these days is her adorable baby girl, Harper Seven.

Ever since she arrived in New York for Fashion Week, Victoria Beckham has been seen all over town with the adorable newborn -- and yesterday, they went on a shopping spree in SoHo.

The two were seen perusing the shelved at Isabel Marant on Thursday, where Harper looked exhausted from all the excitement.

At one point, it looks like Victoria took control of diaper duty ... while on a couch inside the store!

Check out all the cute mom and daughter pics.

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