Anna Kournikova and Enrique Iglesias are first-time parents -- she gave birth to twins over the weekend ... TMZ has learned, but the real miracle is ... no one had a clue she was pregnant!
Sources in Miami tell us Anna had a boy and a girl Saturday in Miami, and their names are Nicholas and Lucy. The only thing overshadowing the blessed occasion is the fact they kept this whole thing a secret for 9 months.
Fact is ... Anna's been way out of the spotlight for more than a year now.