Sports Illustrated bombshell Kate Upton attended an event in NYC last night wearing a red Antonio Berardi dress ($1,318) with nude Yves Saint Laurent platform pumps ($825). From the front it looked like any standard sheath dress, but when Kate turned to the side, bam, a sexy exposed zipper running down the side was revealed. We've seen a plethora of exposed-zipper dresses — mainly running down the back — but we're absolutely loving the side exposed zipper detail; it's fresh and subtly sassy. While Kate's exact is available to shop, we did also hunt down a very similar and less-expensive style that comes in three colors: this Hybrid midi-length dress with side zip feature ($145). Wear it to the office with a blazer and pumps, then come night, throw it on with strappy sandals and shiny baubles to party chic.