The actor, who has three daugters Rumer, 21, Scout, 18, and 15-year-old Tallulah Belle, with ex-wife Demi Moore, claimed that his priority is to be happy with Heming.
"I'd like to have a thousand more children, or zero more children. It doesn't matter. Emma makes me feel great," he told OK magazine.
The 54-year-old, who celebrates his first anniversary with Heming in March, claimed that the couple have a good relationship with Moore and her husband Ashton Kutcher.
"We all get along and I find it interesting that people are so surprised that we all get along. But we do," he said.
Willis's new movie Cop Out is in cinemas from February 26.