Ellen DeGeneres has made a public service announcement urging California voters to oppose a ballot initiative that would ban same-sex marriage.
DeGeneres married Australian actress Portia de Rossi on August 16, two months after the California Supreme Court ruling that legalised gay marriage took effect.
In recent days, the popular talk show host has been criticised in the gay press for not giving money to the campaign to defeat Proposition 8 or otherwise lending her star presence to the cause.
She still has not made a campaign contribution, but earlier this week she posted a video on her show's website. She said when she got married it was the happiest day of her life.
DeGeneres' mother, Betty, has given $US700 ($A1,000) to help defeat the initiative.