Ellen DeGeneres and actress Portia de Rossi have decided to tie the knot, according to the Associated Press. The talk show host reportedly announced the big news while taping an episode of The Ellen DeGeneres Show, in front of a studio audience and de Rossi. The star couple has been dating since December 2004, when de Rossi was filming TV’s Arrested Development. According to People.com, DeGeneres said of de Rossi last year, "We've both changed and grown, and we just feel like, 'Oh, okay, this is completion.’” The couple has yet to reveal any wedding details.