Surprise!  Pauly D is a daddy!  And that came as a surprise to the 'Jersey Shore' star, too.

According to TMZ, Pauly D recently discovered that he fathered a daughter
with a New Jersey native that he met in Las Vegas last year.

The mom, who is 26, filed court documents in New Jersey to establish paternity, but Pauly D has already taken a paternity test that proves he is the father.

The baby is reportedly a few months old and living with her mom.  Pauly D appears to be excited, at least according to his Twitter account!