Katherine Heigl believes adoption is a "rewarding" endeavour.

The 32-year-old actress adopted a South Korean child in 2009 with her songwriter husband Josh Kelley.

Her two-year old daughter Nancy Leigh brings infinite joy to Katherine.

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.

Katherine's sister Meg, who is also originally from South Korea, was adopted by the actress' parents. She and Meg are really close. The star 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."

Katherine's upcoming romantic comedy New Year's Eve will premiere in US theatres on December 9.