Credit: Kevin Mazur/TCA 2009/

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 "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.