Rosie KosterActingNo biography available.Known For4.2Occurrence at Mills Creek20207.0A Beautiful Day in the Neighborhood2019Fan ClubNo Nerds have favorited Rosie Koster yet — be the first.All fan clubsFrom NerdspinFilmographyActor22020Occurrence at Mills CreekFilmDr. Alex★ 4.22019A Beautiful Day in the NeighborhoodFilmEsquire Employee (uncredited)★ 7.0
