Article continues below advertisementSydney Sweeney is heating up Instagram once again!Article continues below advertisementThe Euphoria star dropped a jaw-dropping mirror selfie showing off a tight black strapless top that hugged her curves in all the right places. Standing in front of a mirror, Sweeney held up her phone and let the structured corset-style piece do all the talking.Article continues below advertisementSource: @sydney_sweeney/InstagramSydney Sweeney shared a mirror selfie on Instagram.