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波西生於美國馬里蘭州的巴爾的摩市<ref> [http://leadercall.com/obituaries/x1593292412/Obituaries-for-Friday-March-28-2008/print "Obituaries for Friday, March 28, 2008] {{webarchive|url=https://web.archive.org/web/20120318031516/http://leadercall.com/obituaries/x1593292412/Obituaries-for-Friday-March-28-2008/print |date=2012年3月18日 }} March 28, 2008, Leader Call</ref><ref>[http://www.laurellittletheatre.com/stories.html#parents "Now, We're Just Parker Posey's Parents - Humor Keeps Actress's Popularity In Perspective"] {{webarchive|url=https://web.archive.org/web/20150717035029/http://www.laurellittletheatre.com/stories.html |date=2015-07-17 }} July 2006, Jackson Mississippi Clarion-Ledger</ref>，母親是位廚師，父親經營一家雪弗蘭專賣店，波西還有一位雙胞胎兄弟，父親為她取「派克」這個男孩子氣的名字據說是為了紀念五六十年代美國的超級名模蘇齊·帕克。