Brittany Snow showed off her toned body in a tiny white bikini during her milestone birthday celebration. The now 40-year-old enjoyed the festivities poolside with her friends and family, and she displayed a lively carousel on social media. She donned a textured bathing suit with matching white glasses and beachy waves, while holding her adorable dog in one hand and a cocktail in the other. © InstagramBrittany celebrated her birthday The actress captioned the post: “The most magical birthday in the desert. So grateful to celebrate with my favorite people in a space that was truly perfect. Thank you to @airbnb.” In her carousel she also included a picture of herself in a chic teal satin dress surrounded by birthday balloons.  In another shot, she posed in a texturized pastel pink floor-length dress by the pool with her dog, while sporting white shades, white sandals and gold jewelry. © InstagramShe turned 40 In a second photo set, she showed off a black one-piece with cutouts, with a beige skirt and gold frames and earrings, which she …