Jeans, Jeans.

In L.A., where the stars dictate what everyone wears, where everyone eats and what watering holes they favor, it's not surprising that the biggest star of the town's fashion week was from Hollywood's elite.

Justin Timberlake and his childhood friend Trace Ayala showed looks from his new line, William Rast, to a star-studded crowd. The line was praised for its casual cool and its "wearability." The Southern-themed line offers faded baggy jeans for men, dark-washed skinny jeans for women and lots of vintage- and Tennessee-inspired t-shirts and hoodies. Items retail from $58 to $310.

In other fashion week news, homegrown Rock & Republic, a brand known for its high-end jeans, has outgrown the local shows and moved onto the New York stage. Rock, which expects $100 million in wholesale sales this year, spent about $2 million on its big-time debut and took the Big Apple by storm. Thus, the company's L.A. presence was on a smaller scale.

Rock held a media preview at the Beverly Wilshire and then a party at West Hollywood club Area where loops of the New York runway show played on large plasma screens. The move to a bigger show is all part of R&R's expansion beyond a jeans company into a lifestyle brand. The company now has a full line of professional clothing, accessories and fragrances. Chief Executive Michael Ball said this is all part of his greater 15-year plan to go public, now about five years off.