Here are some captures of Selena Gomez from the movie "Spring Breakers" and although there are already a lot of photos from it, I haven't seen any of this exact scene. You can clearly see her thong in the pictures where her legs are up.
Laci Kay Summers is an American model, actress and singer from California. She is mostly known as an Instagram star with almost 11 million followers. Video and photos leaked from her snapchat account which was hacked recently.