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Karlie Kloss is a model mother ... and, she's got her hands -- and chest -- full with her newborn in new pics she shared to Instagram Sunday.

The former Victoria's Secret Angel shared several photos with her daughter, Rae , who was born just a couple weeks ago ... including one where Mom's in a facemask while breastfeeding her little one. Getty Composite

KK's grinning wide here ... beaming after welcoming her third child with her husband, Joshua Kushner .

Other shots show Rae curled up on Karlie's chest sleeping and Karlie holding her in a veritable field of flower bouquets expressing congratulations on the birth.

Kloss shared a photo of her daughter's little hand just a few days after she was born ... adding a "welcome to the world message" to her Instagr

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