Article continues below advertisementSydney Sweeney kept it flirty and fun in behind-the-scenes footage of her Cosmopolitan photoshoot, where she rocked lingerie from her new fashion brand SYRN.The Euphoria star, 28, and her label reposted the video from the style magazine's Instagram on January 31.Article continues below advertisementSYRN Is Sydney Sweeney's New Lingerie BrandSource: @cosmopolitan/InstagramSydney Sweeney modeled her new lingerie brand, SYRN, for her 'Cosmopolitan' photoshoot.Sweeney donned a lacy black bralette and matching bottoms with tight strings sitting across her hips.