Jennifer Aniston's fiancé, Justin Theroux, passed along his ring-buying expertise to her We're the Millers co-star, Jason Sudeikis.

The 41-year-old helped Sudeikis pick out the perfect engagement ring for his lady Olivia Wilde.

"Somebody helped him on the ring," Aniston told E! Online at the New York premiere of We're the Millers on Aug. 1. "Not me, but my fiancé did."

While Theroux didn't help Sudeikis design the ring, he "guided him in the right direction," Aniston said.

Sudeikis proposed to the Rush actress earlier this year. The actor gushed about his lady, saying she's "hilarious and kind and sweet," during an interview with Elle magazine for the August 2013 issue. The actress returned the kind words when she boasted about her fiance's talents in the September 2013 issue of Fashion.

"His skill level is so high. I really have learned a lot from him, especially when it comes to being bold and taking risks as an actor within a role," Wilde told the magazine. "Comedians are so great about trying things, like doing seven takes in seven different ways and really not being afraid to stumble."

One of the roles she's referring to is Sudeikis' upcoming movie with Aniston. The comedy also stars Emma Roberts and Molly C. Quinn. In the film, Aniston plays a stripper and pole dances in lingerie in one scene.

"You might see more than you want to see," Aniston told Access Hollywood in May about her role. "[Stripping] was so much fun. I had a great choreographer - she was fantastic, and it was to great music and it was fun."

She also explained that she had to enhance her work out routine in order to look fit on camera.

"[I] just doubled the amount that [I] normally do," she explained. "You get up into my age and you've gotta do a little bit more."

We're the Millers arrives in U.S. theaters on Aug. 9.

Tags
Jennifer Aniston, Justin Theroux, Olivia Wilde, Jason Sudeikis