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Cardi B just dropped her latest release -- her first child with NFL star Stefon Diggs is here ... TMZ has learned.

Sources connected to the Diamond-selling rapper tell us Cardi gave birth to the baby boy last week.

We're told Stefon, the New England Patriots star receiver, was with Cardi when their baby boy arrived. Play video content

Cardi announced the birth Thursday in a social media post.

Cardi says ... "My life has always been a combination of different chapters and different seasons. My last chapter was the beginning of a new season. Starting over is never easy but it’s been so worth it! I brought new music and a new album to the world! A new baby into my world, and one more reason to be the best version of me, one more reason to love me more than anything else or a

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