Ellen DeGeneres and Portia de Rossi flashed matching smiles yesterday while out for a walk in St. Barts. The duo are off enjoying a fun vacation to celebrate wrapping up another successful year. It's been a busy one for Ellen with her daytime TV show, and she also kept fans laughing with her tweets — Ellen ranked among your favorite people to follow on Twitter. Portia, meanwhile, had a whirlwind press tour to promote her new book about her struggles with an eating disorder. She and Ellen are among the cutest couples of 2010, and they cemented their place on the list by bringing their PDA out on a boat to wrap up their afternoon of sightseeing with a cruise.