Instead, Knox rocked dyed red hair styled in spikes, which revealed a shaved bleach-blond layer on the sides. Meanwhile, Angelina shared that her custody agreement with Brad would end when their twins Knox and Vivienne turned 18, after which she planned to spend time traveling the world. I'll spend a lot of time in Cambodia. I'll spend time visiting my family members wherever they may be in the world." © Getty Images The star explained that her custody agreement ended when Knox and Vivienne turned 18Knox and Vivienne celebrated their 18th birthday on July 12.