Arrival date: December 20
Meet the dad: Teri's live-in boyfriend, musician Jamie Wollam
It's a... girl! Her name is Baley
And baby makes... five! Bayley joins two big brothers -- one from her mom's previous relationship and one from her dad's -- Griffin, 5, and Carter, 9. Bayley is the couple's first child together.
Pregnancy diary: Polo's rep confirmed to E! News that Bayley was born at 3:02 p.m., weighing in at 7 pounds (December 21).

Check out which stars are currently pregnant in our Celebrity Baby Tracker.