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Angelina Jolie and Brad Pitt's daughter Zahara Marley Jolie-Pitt is officially part of the sisterhood ... after joining a sorority in her second year at Spelman College.

The 18-year-old was decked out in a black knee-length dress -- matching all of her fellow pledges -- and danced out in front of the line for her "crossing ceremony" ... as her peers chanted and cheered.

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