Mystery Spandex and Tulle Fitted Evening Dress

Mystery (meaning I have no label, no idea) - Spandex and Tulle Fitted Evening Dress, size S. (no size listed and I am a size 4. Will continue to look.) This is a hot dress, totally fits every curve, tulle pleats flair out around the bottom of the dress. The rest of the dress is extremely form-fitting. Zippered back. This is worth more than $25 but I cannot find a label on this anywhere. This came from a friend so will part with it gently, if you love it. Looks fab.