Angelina Jolie has revealed that she and her partner Brad Pitt were nervous about working together on their new project, By the Sea.

The Hollywood couple will share the screen together for the first time in almost a decade in the upcoming movie, which Jolie will also direct from her own script.

The actress revealed that they were nervous about working together on the project as it deals with heavy relationship issues.

She told The Inquirer: "We have been shy of it for quite a few years because it's very heavy, about a relationship, people going through and surviving a lot together.

"It's not easy. So we were nervous about being able to handle the material as actors and to take it on together."

She added: "Obviously Brad is willing to have me direct him in a film and work with me.

"He's extremely supportive, which is wonderful, because we're interested in different aspects of film."

Pitt and Jolie first worked together on 2005's Mr and Mrs Smith.

Jolie's previous directorial features include In the Land of Blood and Honey and Unbroken.