The Arrested Development star was born in Australia and moved to the U.S. in the 1990s to pursue an acting career in Hollywood.

Now de Rossi, who is married to comedienne Ellen DeGeneres, has made her move permanent by officially becoming an American citizen.

DeGeneres took to her Twitter.com page to share the happy news with fans on Thursday, tweeting, ""Today my wife officially became a U.S. Citizen. Congratulations Portia and America.""