Jennifer Aniston is "hysterically funny" to work with on set, says Justin Theroux.

The pair met while filming the upcoming comedy Wanderlust and have since embarked on a relationship. Justin says Jennifer was a joy to work alongside.

"My first impression working with Jennifer is how spontaneous she is," Justin revealed in an interview with ET Online. "She's an incredibly present and hysterically funny actress. We [immediately] had a fun time."

Meanwhile, Jennifer repaid the compliment.

"[It was] easy. [He is] completely funny and kind," Jennifer gushed. "He's just really good."

In the movie, Jennifer and co-star Paul Rudd play a married Manhattan couple who move to a rural commune after facing sudden unemployment. It's there they meet Seth, played by Justin.

Jennifer loved her on-screen team.

"They're just great actors," she told British newspaper The Telegraph. "Everybody has a little quirk.

"Certain people had a hard time learning lines, or learned their lines and would flub off when they were doing off camera, and then some people had an issue with cracking up. Paul Rudd is a notorious breaker. So am I, I may as well out myself while we're at it."

Wanderlust is directed by David Wain and is released in the UK on March 2.