Dress: Julieta Dress by Reformation (Thanks magnificentgalaxyprince!)
Spencer Hastings (played by Troian Bellisario) on Pretty Little Liars on Freeform was spotted wearing this bridesmaid dress on Pretty Little Liars on episode 'Til DeAth Do Us pArt' (7x20) in Jun 2017. Spencer's Dress is the Julieta Dress by Reformation .