02/23/2012 03:41 am ET Updated Apr 23, 2012

Jennifer Aniston And Justin Theroux: Letterman Goads Paul Rudd Into Talking About Their Relationship

It isn't exactly a secret that Jennifer Aniston and Justin Theroux have been dating for nearly a year, but Paul Rudd still seemed nervous to talk about his "Wanderlust" co-stars' relationship when he sat down to tape "Late Show" (Weeknights, 11:35 p.m. EST on CBS). When David Letterman started poking and prodding him for gossip about their love life, Rudd stammered and hesitated at first.

"I think somebody in the film actually is a "friend" of hers," Letterman said. "Am I right about that? Maybe you can't say. Can you say?"

He pushed and pushed until finally, Rudd replied, "Jennifer Aniston, I believe, is dating Justin Theroux." Theroux also stars in the film with Rudd and Aniston. The two have reportedly been romantically involved since May 2011.

"You heard it here first," Rudd quipped. Aniston has been making the rounds herself in promotion of the film and has begun talking more openly about her relationship. Plus, Theroux was present when Aniston recently received her star on the Hollywood Walk of Fame.

Paul Rudd can be seen starring alongside Jennifer Aniston and Justin Theroux in the comedy film "Wanderlust," in theaters February 24, 2012. David Letterman can be seen on "Late Show" weeknights at 11:35 p.m. EST on CBS.

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