— Instagram/@yslbeautyHailey Bieber is the latest voice to join YSL Beauty’s new digital series to promote the brand’s Libre Flowers & Flames fragrance. For the project, she appeared in two photos shot by photographer, Tyler Mitchell. According to the brand’s Instagram post on July 31, the series features “a diverse group of four feminine icons.” And what perfect timing for Bieber to flex her female empowerment muscles: the model and entrepreneu…