The couple, who wed in 2008 during the time same sex marriages were legal in California, threw a casual BBQ at a ranch near Santa Barbara.
PHOTOS: Ellen And Portia Celebrate Their 4th Anniversary
As RadarOnline.com previously reported, Ellen will also be celebrating the 10th season of her hit talk show when the new season premiers September 10.
Appearing that day will be Jennifer Aniston, who was Ellen’s very first guest in 2003.
Hopefully the anniversary girl can get the newly-engaged Aniston to dish!