No doubt taking advantage of some rare time off from his hectic schedule, the movie star and his other half blew some cash at The Grove mall in Los Angeles.
It's been a year of much success for the 33-year-old, both on screen and off.
He wed his partner in August and has also enjoyed massive success professionally.
He recently completed production on the next season of his popular Sky One series 'Moone Boy' and Roscommon-born O'Dowd is now back in the US, where he and Porter first met.
O'Dowd spends a lot of time working in America, but has insisted he and Porter are still based in London.
After the smash hit 'Bridesmaids', O'Dowd has worked on several films, including 'The Sapphires' and John Michael McDonagh's 'Calvary', which will be released next year.