It turns out that there are a lot of interesting facts about him that you may not have known. So, while you send your well wishes to the engaged couple, gain some knowledge about the soon-to-be Mr. Aniston.
1. Recognize His Face?: Theroux has been on the big screen a number of times. You might remember him from Your Highness, Charlie's Angels: Full Throttle, Miami Vice, Zoolander and, of course, Wanderlust (where his romance with Jen began). You can also hear Justin's voice in Call of Duty: Modern Warfare 2.
2. Missing Friend: The romance with Aniston could have happened ages ago. It just so happens Theroux turned down a screen test for the hit show Friends. He later said, "Who wouldn't want to be a bazillionaire, but I don't really regret it."
3. Sex and the City The actor appeared on the HBO series twice as different characters. On the episode "Monogamists," he played Jared, a braggy novelist who flirts with Carrie at a bar. Then he came back a year later as Vaughn, an author who unfortunately suffered from premature ejaculation. Oh, and that episode was called "Shortcomings."
4. Connection Game: His father is novelist Paul Theroux, who wrote The Mosquito Coast. Its film adaptation starred River Phoenix, who was in A Night in the Life of Jimmy Reardon with Matthew Perry, who was on Friends with Jennifer Aniston!
5. He's Got Moves: Justin can bust a move like no other. Theroux showed off his breakdancing skills in Zoolander and more recently, on Ellen (thanks to Jen).
6. A Night to Remember: Academy Award-nominee (documentaries) Rachel Grady and her friend, Brooke Jones, took Justin Theroux to his first prom in Washington, D.C., and Justin's journalist mother, Phyllis Theroux, reported on their date in the June 5, 1985 New York Times.
7. There's Another Theroux: Ladies, don't be sad. Justin has a younger brother (born in 1989) named Sebastian.
8. Meat Lover Hater: You won't find this guy grubbing on a hamburger or filet mignon. Jennifer Aniston's man is a vegetarian.
9. Isn't That Funny?: Theroux guest-starred in a number of episodes of Parks and Recreation and in one of his episodes, Theroux's character's love interest talks about Jennifer Aniston picking the wrong guys. Ha!
10. Writing Runs in the Family: Justin comes from a long line of accomplished writers, and has some big achievements under his belt, too. Theroux has written scripts for multiple box office hits, including Tropic Thunder, Iron Man 2 and Rock of Ages.