Designer collaborations are a hot ticket these days, and US department store Kohl's is debuting its first-ever collection with Narciso Rodriguez in its Design Nation series. Inspired by a trip to Istanbul, the line is filled with bold color-blocking and graphic lines. Emma Roberts and Katie Holmes both showed up to celebrate the line in NYC on Tuesday. Emma wore a sleek v-neck dress from the collection and told us her must-have piece - hint, it's spotted! Watch on to see more.">