"They are thrilled," her rep told the magazine, of Campbell and actor JJ Feild.
And although she is with child, the 38-year-old "Party of Five" star is still working. She can be seen in Lifetime's "Sworn to Silence," a film that she also executive produced.
Feild, 33, starred in "Captain America: The First Avenger" and will be featured in "Austenland."