icing ▁that ▁Charlie ▁is ▁starting ▁to ▁act ▁exactly ▁as ▁Ser ena ▁and ▁ste als ▁Ser ena ' s ▁dress . ▁In ▁the ▁season ▁finale , ▁Ser ena ▁gets ▁Charlie ▁help ▁with ▁a ▁medical ▁condition , ▁though ▁it ▁is ▁later ▁revealed ▁that ▁Charlie ▁is ▁really ▁I vy , ▁and ▁I vy ▁is ▁just ▁acting . ▁Later , ▁while ▁walking ▁the ▁streets ▁of ▁Los ▁Angeles , ▁Ser ena ▁gets ▁offered ▁a ▁job ▁in ▁Hollywood ▁where ▁she ▁dec ides ▁to ▁move ▁to . ▁ ▁Season ▁ 5 ▁ ▁In ▁Season ▁ 5 , ▁Ser ena ▁is ▁working ▁as ▁a ▁film ▁producer ' s ▁assistant ▁in ▁Los ▁Angeles ▁and ▁sp ending ▁her ▁free ▁time ▁with ▁N ate ▁and ▁Ch uck . ▁Although ▁Ser ena ’ s ▁b oss , ▁Marshall , ▁is ▁difficult ▁to ▁please , ▁his ▁b oss , ▁Jane , ▁prom otes ▁Ser ena ▁after ▁she ▁succeed s ▁at ▁a ▁task ▁that ▁Marshall ▁failed . ▁Later , ▁she ▁runs ▁into ▁Charlie ▁and ▁convin ces ▁her ▁to ▁move ▁with ▁her ▁back ▁to ▁New ▁York . ▁ ▁When ▁Dan ▁tells ▁Ser ena , ▁N ate , ▁Bla ir , ▁Ch uck , ▁R uf us ▁and ▁L ily ▁that ▁he ▁wrote ▁a ▁book ▁about ▁his ▁life ▁and ▁their ▁roles ▁in ▁it , ▁Ser ena ▁is ▁off ended ▁when ▁he ▁port ray s ▁her ▁as ▁a ▁self - center ed , ▁prom is cu ous ▁party - g irl ▁and ▁is ▁even ▁more ▁ups et ▁when ▁Bla ir ▁tells ▁her ▁that ' s ▁exactly ▁who ▁she ' s