Tyra Banks: I Just Had America's Next Top Baby

Surprise, Tyra Banks had a baby!

Not that we even knew she was expecting, but the supermodel just announced she and her bf Erik Asla had a little boy ... with the help of a surrogate.

Tyra announced the birth on IG with a knitted baby cap and the caption, "He's got my fingers and big eyes and his daddy Erik's mouth and chin. As we thank the angel of a woman that carried our miracle baby boy for us, we pray for everyone who struggles to reach this joyous milestone."

As for the tyke's name -- York Banks Asla. People first reported the birth. This is 42-year-old Tyra's first child. She and Erik, a photographer, started dating about 2 years ago.

Mazel!