Jennifer Aniston & Justin Theroux: From Telluride to Purgatory
updated 01/12/2012 AT 11:00 AM EST
•originally published 01/12/2012 AT 08:10 AM EST
The Wanderlust costars, who have been romantically linked since May, attended Monday's HBO screening of Paradise Lost 3: Purgatory.
The couple flanked Jason Baldwin, director Joe Berlinger and fellow actor Orlando Bloom for a photo at L.A.'s Ray Kurtzman Theater, within the Creative Artists Agency.
"They were very sweet and social as always. They're really comfortable with each other," an onlooker tells PEOPLE. "Seemed like just another night on the town."