Article continues below advertisementSydney Sweeney knows how to grab attention! The Euphoria star is turning up the heat in a bold new shoot for her lingerie brand, Syrn. In a series of sultry photos shared to the label's official Instagram, Sweeney posed topless from behind while sitting on a sleek black chair, confidently showing off a black thong and sheer stockings.Article continues below advertisementSource: MEGASydney Sweeney posed topless to promote her lingerie line.