The "Friends" alum hit the red carpet premiere for her new comedy "She's Funny That Way" at the Harmony Gold theater in Los Angeles on Wednesday.
Aniston sported a black Roland Mouret jumpsuit and flashed her new wedding ring: a gold band encircled with diamonds said to be designed by her pal Jennifer Meyer.
The "Cake" star appeared sans husband; Theroux was spotted wearing his wedding band at LAX earlier this week while catching an outgoing flight. E! News said he's currently in Austin, Texas, shooting Season 2 of his HBO series "The Leftovers."
Aniston also kept a tight lid on the details of their surprise Aug. 5 nuptials.
"We had the beautiful luxury of having a beautiful private moment and I'm going to be selfish and keep it that way!" she told ET.
Aniston and the "Zoolander 2" writer tied the knot at her sprawling Bel-Air estate with several celebrity friends among the guests, including Courtney Cox, Ellen DeGeneres and Howard Stern. A few of those pals joined the newlyweds on their honeymoon in Bora Bora: Cox, Chelsea Handler, Jason Bateman and Jimmy Kimmel were reportedly among them.