By Kate Ward
Updated July 19, 2011 at 08:15 PM EDT

There will be diapers for Paul Thomas Anderson and Maya Rudolph. The There Will Be Blood director and Bridesmaids star have welcomed their third child, People reports. Jack was born on July 3, and is little brother to Anderson and Rudolph’s two other children: 5-year-old Pearl and 20-month-old Lucille.