The 24-year-old star took to Instagram to stand in solidarity for Jolie, 41, who split from her husband Brad Pitt last month, saying she admires "anyone who transforms their pain into power".
"My admiration for Angelina Jolie is endless, I also admire anyone who transforms their pain into power. I admire unruly activists. I admire her continued involvement with the UN as a goodwill ambassador.
"She is ruthless, determined and unforgiving in her efforts to make a difference for Refugee's. She also inspired me to follow my dreams into acting and have higher goals of one day becoming a director," she wrote.
The 'Girl Up' campaign is run by the United Nations Foundation, aims to engage with girls and get them to take action and stand up for their rights.
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