Angelina Jolie for St John

Angelina Jolie stars in the latest St. John advertising campaign

Angelina Jolie stars in another season of advertisements for US luxury brand St. John.

The actress has been a spokeswoman and model for the brand since September 2005, and has also been involved with the company's charity, which helps children's causes.

At the time she commented on her new role, 'I am a working mother who has set goals to accomplish a lot in this world. I want my wardrobe to be beautiful, sexy and comfortable — all at the same time. St. John is all of those things.'

The black and white images show a demure Angelina in a series of classic little black dresses. The photographs were taken before her pregnancy bump started to show.

Jolie is currently pregnant with her second biological child, adding to her family of three adopted children with partner Brad Pitt. The Daily Mail is today reporting that the actress is due to have twins, with a source revealing, 'They're having twins, Angelina is healthy, and he's thrilled that he's going to be a father once again. Brad's telling everybody close to him, because he's having to change around his work schedule to get ready for the birth.'