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Millie Bobby Brown and Jake Bongiovi braved the chilly New York City streets ... but, they're not risking they're daughter getting a cold ... because Millie used her body heat to keep her warm.

The two stars were spotted walking around Manhattan Sunday ... all smiles as they enjoyed a relaxing stroll as a family. Backgrid

However, the pair left the stroller at home ... opting instead for Millie to simply hold their little one against her chest.

Not only did it seem to provide adequate warmth ... but it gave Millie the opportunity to speak softly to her daughter ... whispering to her occasionally with a huge grin on her face. Backgrid

Jake also planted a loving kiss on his wife's forehead during the walk ... an endearing family picture fo

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