Zeta-Jones, Douglas and her parents, Patricia and David Jones, spent 90 minutes Friday touring facilities at the Children's Hospital for Wales in Cardiff.
U.S. & World
Four years ago, the Hollywood couple officially opened the hospital which included both treatment and play wards.
On Friday, she told reporters: "It really is an honor for me to come back when it's running."
Zeta-Jones, who was born in the Welsh city of Swansea, became a patron of the Noah's Ark Appeal for a Welsh children's hospital in 2000. The appeal is now working to raise 7 million pounds (.8 million) to complete the second phase of the project.
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