The Leftovers star had the message done by tattoo artist Scott Campbell, who is married to actress Lake Bell, and seemed quite pleased with the result when he shared it on Instagram. "Thanks @scampbell333 and fellow birthday boy @lousyleo for letting me bite it. #thanksagainagain," he wrote.
Theroux's birthday falls just a week after his and Aniston's one-year wedding anniversary. The couple tied the knot at their home in Bel-Air, California, on Aug. 5, 2015, in a surprise wedding ceremony disguised as a 44th birthday party for Theroux. The two haven't had a problem keeping the details private, even a year later.