The usually chipper and funny Ellen DeGeneres is getting serious and somber in a new public service announcement, where she encourages California voters to vote against Proposition 8, a ballot initiative that would ban marriage between same-sex couples.

Ellen, who married longtime love Portia de Rossi on Aug. 16, posted the video PSA on her show's website, on which she said:

"I got to do something this year that I never thought I'd be able to do -- I got married. It was the happiest day of my life. There are people out there raising millions of dollars to try to take that right away from me. You've seen their ads on TV. They're twisting the truth, and they're trying to scare you. I believe in fairness. I believe in compassion. I believe in equality for all people -- Proposition 8 does not. Please, please vote no on Prop. 8."

Other celebs taking a stance against Prop. 8 include Brad Pitt and Steven Spielberg, who have each contributed $100,000 to defeat the measure.