Katherine Schwarzenegger announced the birth of their son on Instagram on Monday.

They revealed the name of their son as Ford Fitzgerald Schwarzenegger Pratt.

"We are overjoyed  to announce the birth of our son, Ford Fitzgerald Schwarzenegger Pratt. Mama and baby are doing well and Ford’s siblings are thrilled by his arrival. We feel so blessed and grateful. Love, Katherine and Chris," the couple posted on Instagram.

They have two daughters Lyla and Eloise.

Pratt also has a son named Jack who was born with former wife Anna Faris.

Chris Pratt and Katherine Schwarzenegger have been married since 2019.