Exhibit 99.1 Yatsen Announces Third Quarter 2021 Financial Results and US100MillionShareRepurchaseProgramConferenceCalltoBeHeldat7:30A.M.U.S.EasternTimeonNovember18,2021GUANGZHOU,China,November18,2021/PRNewswire/−−YatsenHoldingLimited("Yatsen"orthe"Company")(NYSE:YSG),aleadingChinesebeautycompany,todayannounceditsunauditedfinancialresultsforthethirdquarterendedSeptember30,2021andtheauthorizationbyitsboardofdirectorsofaUS100 million share rep ...