After warming with a duo of sexy dresses [1], Kim and Kourtney Kardashian stepped out Saturday night in Miami to celebrate friends David Grutman and Isabela Rangel's wedding in two eye-popping outfits. Again, the sisters seemed to be on the same page with their styles, showing off their respective takes on lingerie-inspired eveningwear.

For Kourtney, that meant a see-through lace halter dress with visible black panties, while Kim channeled the sultry look in a silk and lace bustier dress (that looked a lot like a nightie) and diamond choker. Clearly, Kim was feeling her look — she shared snaps of her dress and a series of revealing shots on her Instagram [2].