Angelina Jolie’s Sons Pax and Maddox Hard at Work on Mom’s Movie Set

Angelina Jolie is getting some help from her sons, Maddox and Pax, on the set of her upcoming film, ’Maria,’ based on the life of opera singer Maria Callas. Angie’s two eldest kids have worked with their mom in the past, both collaborating with her on the movies ’Without Blood’ and ’First They Killed My Father.’ Meanwhile, the Oscar-winner’s daughter, Vivienne, is working as a volunteer assistant on Angie’s upcoming Broadway adaptation of ’The Outsiders.’