Cristiano Ronaldo stepped out with girlfriend Irina Shayk yesterday in NY -- two days after telling the world he's the father of a brand new baby boy.

Over the weekend Ronaldo announced, via his Facebook, "It is with great joy and emotion that I inform I have recently become a father to a baby boy. As agreed with the baby's mother, who prefers to have her identity kept confidential, my son will be under my exclusive guardianship."

Though the soccer stud and his hot model GF were spotted at Da Silvano, the newborn was not.

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