The couple, who have been married for six years, posted a selfie on Twitter looking loved up.
Portia uploaded the natural image of herself and her partner enjoying a stroll on the beach, captioning the picture "Saturday".
The actresses were both dressed casually and without makeup for the beautiful shot.
Ellen, 56, and Portia, 41, live in Beverly Hills, with their pet dogs and cats.
Last month Portia appeared on The Ellen DeGeneres Show with her wife to answer a range of questions, including whether there was a baby on the horizon.
"It would be so fun for everybody if we were," said Portia on the show. "Yeah, they want us to have a baby," said Ellen. "So we're not gonna have a baby?" "No, we're not," said Portia.
We wish them a very happy anniversary!