A 2009 AP file photo of Kevin Costner.
Costner's 36-year-old wife, Christine, gave birth to Grace Avery Costner on Wednesday afternoon in Los Angeles.
The actor's publicist Arnold Robinson says mother and daughter are doing well.
The couple have two other children, 1-year-old Hayes and 3-year-old Cayden. The 55-year-old actor has three grown children from a previous marriage.
