Katherine Heigl has admitted that she wants to have more children.

The 33-year-old actress is already mother to three-year-old Naleigh who she and her husband adopted from Korea in 2009.

Katherine has been married to singer Josh Kelley for four years and they apparently want to adopt a few more little ones, but she is undecided on exactly how many they want.

Speaking on Ellen DeGeneres' talk show today, the Knocked Up star responded to the comedian's question on if she would like more children with a resounding yes.

"I do. I would love to yeah," Katherine said. "I used to want like six kids and then I went, wow No thanks. So we're thinking maybe like three to four kids. That would be my ideal."

"That's still a lot," Ellen quipped.

"That's still a lot isn't it? All right maybe two," Katherine decided.

The star is a supporter of more people experiencing the benefits of welcoming a foster child into their family.

"I think it's so rewarding for everybody and it's just so amazing to become a parent no matter how you become one," Katherine explained to ET Online.

Her sister Meg, who is also originally from South Korea, was adopted by the actress' parents. She and Meg are really close and Katherine deeply appreciates the bond she has cultivated as a result of adoption.

"I have this amazing, beautiful daughter in my life that I wouldn't have had otherwise and I have this amazing wonderful beautiful sister in my life that I wouldn't have had otherwise so I think adoption should be on everybody's mind and people should be a little more open to it."