Angelina Jolie and Brad Pitt's son Maddox celebrated his birthday with a two-day, boys-only party at the weekend.

The birthday boy - who turned six on Sunday - was joined by a group of young friends for a military-themed party in the garden of Brad and Angelina's oceanfront home in Santa Barbara, California.

Maddox and his young friends were all dressed in army combat uniforms and had camouflage make-up painted on their faces as they enjoyed action-packed activities including water pistol fights and pelting each other with water bombs. Brad, 42, also joined in the fun wearing an army outfit and helmet.

Maddox - who was adopted from Cambodia - is the oldest of the couple's four children. Brad and Angelina also have adopted three-year-old Vietnamese son, Pax, two-year-old Ethiopian daughter Zahara, and 14-month-old biological daughter Shiloh.

Earlier this week, it was revealed Brad, Angelina and Shiloh will appear on a new Australian stamp. A picture of the 'Mr. and Mrs. Smith' co-stars and their youngest daughter - which featured on the front cover of A New Idea magazine shortly after Shiloh's birth last year - has been made into a 50 cent stamp.

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