The Bridesmaids star seemingly exchanged vows with his British presenter fiancee, Dawn Porter, over the weekend (24-26Aug12).
O'Dowd announced the news on Sunday (26Aug12) by uploading a photo of the couple, complete in matching tracksuits, on Twitter.com alongside a caption, which reads, "Just married!!!!"
A representative for the actor had yet to confirm the news at the time WENN went to press, however, Porter also alluded to the nuptials, suggesting they exchanged vows on Friday (24Aug12).
On Thursday (23Aug12), before the alleged big day, she tweeted the lyrics to Annie's famous song Tomorrow, "Tomorra, tomorra, I'll love ya, tomorra, " later adding, "For someone who doesn't quite fit into her wedding dress I sure hoofed that Thai take out like it was the last meal I would ever see."
And on Friday she cryptically continued, "Gulp," - just before jokingly making a reference to a potential name change, "That's Dawn O'Porter to you!! "
Meanwhile, on Sunday she vowed to update fans about the wedding in the coming days - in a post, she wrote, "It was incredible. I promise to tell you all about it soon. For now it's just for us... perfect."
O'Dowd popped the question over the Christmas (11) season.