Angelina Jolie is reportedly concerned about Jennifer Aniston releasing a tell-all book.

The 'Maleficent' actress grew close to fiancé Brad Pitt while they were filming 2005's 'Mr & Mrs Smith' - when the hunk was married to the 'Friends' actress - and the brunette beauty is worried about a book deal which Jennifer has been offered since it will dredge up details of the past.

A source told Now magazine: ''Angelina's worked hard to build up her image as a humanitarian and separate herself form the public outcry when she got together with Brad.

''She felt the whole 'Team Jen' and 'Team Ange' thing had finally died a death and that the perception of her being a husband stealer was in the past, but then she heard about the book offer.''

Jennifer - who is engaged to Justin Theroux - realises the chapter where she details the breakdown of her marriage to Brad will be difficult for her to write, but also understands that it'll be the one everyone wants to hear.

The source added: ''If Jen does sign a book deal, she knows the chapter on Brad and Ange will be the hardest for her to write - but it will also be the one everyone will be after. Jen doesn't want to spark any new rows, but there's so much history involved that it's inevitable.''