Snap back queen! Kim K takes the plunge in a sexy swimsuit

Kim Kardashian showcased her sexy curvaceous physique in a bathing suit for the first time since giving birth to her son Saint nearly five months ago. Mrs West wore a plunging black one-piece as she enjoyed the waters of the Blue Lagoon Geothermal Spa in Grindavik, Iceland during her sister Kourtney's 37th birthday celebration, with their friends Jonathan Cheban & Simon Huck, along with Kim's assistant, Stephanie. See more photos after the cut.