KirstierevolvesaroundMadison"Maddie"Banks(Alley),arenownedBroadwaystarwhofindsherlifeturnedupsidedownwhenArlo(EricPetersen),thesonshegaveupatbirth,suddenlyappearshopingtoconnectafterhisadoptiveparentshavedied.However,Maddiedoesn'texactlyseenerdyandschlubbyArlofittinginwithherluxuriouslifestyle.ButwhenMaddie'sassistantandbestfriend,Thelma(RheaPerlman),andoutlandishdriverFrank(MichaelRichards)encouragehertogiveArloachance,Maddieisshockedtofindthatperhapsshehasmotherlyinstinctsafterall.
