United Kingdom, Aug. 12 -- Angelina Jolie is planning to leave Los Angeles.

The 50-year-old actress - who shares custody of her children with former husband Brad Pitt - is set to be looking at putting "the house up for sale" and moving abroad next year when her youngest children, twins Knox and Vivienne, turn 18.

A source told PEOPLE: "Angelina never wanted to live in LA full time. She didn't have a choice because of the custody arrangement with Brad. She plans to relocate as soon as Knox and Viv turn 18 next year. She's eyeing several locations abroad. She'll be very happy when she's able to leave Los Angeles."

Angelina and Brad - who share Maddox, 24, Pax, 21, Zahara, 20, Shiloh, 19, and the twins - finally reached a divorce settleme...