Hilary Duff and Matthew Koma just dropped big news. The couple has welcomed their baby daughter into the world! She arrived last week, on Thursday, and the couple kept her to themselves for a few days before showing her sweet face to the world in an Instagram post Monday. In the caption, Duff also revealed that her daughter who joins Duff's son with ex-husband Mike Comrie, 6-year-old Luca was born at home. Banks won't just be growing up with a big brother, but also with a close-in-age cousin as Duff's sister Hayley recently welcomed her second child, another girl named Lulu Gray. And we're also sure Duff is probably happy to no longer be pregnant.