Trendwatch: Jewelled Necklines

White dresses always look crisp and fresh for the summer - but sometimes the occasion calls for a little bit more sparkle than a simple cotton dress. Stars like Rebecca Romjin (in Azzaro), Emmy Rossum (in Temperley) and Leann Rimes (in Notte by Marchesa) are picking simple white shifts with ornately jewelled necklines. And with all the heavy metal and crystals at the neckline, you don't even need to wear jewellry. What could be simpler?