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Jessica Simpson's belly isn't the only body part getting bigger!

The pregnant singer stepped out today with sister Ashlee and nephew Bronx Mowgli in NYC -- where she put her chest on full display in a revealing top.

While Jessica's bust has always been a focal point, she's almost rivaling Dolly Parton thanks to her pregnancy!

Jess has had no problem showing off her body since she announced she and Eric Johnson ware expecting -- check out the gallery above to see more of her pregnancy style.

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