The Look

Jeweled Necklines

Sienna Miller in Burberry Prorsum

Call it built-in bling. L.A. lovelies are donning duds with gems sewn right into the neckline for instant, easy chic. Super-stylist Rachel Zoe helped Mischa Barton choose a jewel-bedecked Burberry Prorsum dress for an appearance with the brand's creative director, Christopher Bailey. "It was perfect for her," Zoe said. "Mischa loves anything with sparkles." As for how to wear the youthful style, Zoe has a firm recommendation: "Keep everything else simple." Barton and fellow Zoe client Lindsay Lohan followed her advice, choosing sleek hair and understated accessories to go with their embellished minidresses. A look that's stylish and simple? Now, that's a beautiful bargain.

—Betony Toht