Credit: Kevin Mazur/TCA 2009/WireImage.com

Portia de Rossi is now Portia Lee James DeGeneres.

The actress, 37, has officially changed her legal name to take spouse Ellen DeGeneres' last name. Documents at TMZ confirm that a judge granted the star's name change petiion, which she filed in L.A. Superior Court early last month.

The star tells UsMagazine.com: "I am thrilled to legally adopt my wife's name. I will continue to use Portia de Rossi for professional purposes."

After dating for nearly four years, Portia and DeGeneres, 52, wed on Aug. 16, 2008. The bash -- just 30 attended -- took place at the Beverly Hills estate.

Both wore Zac Posen (Portia opted for a princess gown, Ellen, 52, wore an all-white suit) and exchanged rings designed by Neil Lane.