Brad Pitt and Angelina Jolie are planning a secret summer wedding

Estranged: Angelina's actor father Jon Voight

"When Angie and Brad started seriously discussing a wedding, the issue of Angie reconciling with her dad came up again and again.

"Angie came around after her brother intervened and strongly urged her to bury the hatchet."

Although a quiet wedding is planned, there will be a smattering of stars.

"George Clooney and Matt Damon will be going, but other than a few film executive friends, it will be a Hollywood-free zone," adds the friend.

"Angelina and Brad want a low-key ceremony. No one will know it's a wedding until they arrive.

"Instead, they are billing it as a summer barbecue and joint birthday party for Angie and daughter Shiloh.

"Brad is picking out cases of his favourite wine from nearby Santa Maria and Paso Robles and Angelina is busy organising the cake."