CELEBRITY LOOKS OF THE WEEK - KATE, KOURTNEY, COBIE AND MORE!

This week's fashion roundup has celebrities in their finest red carpet-ready frocks. We're loving that effortless chic seemed to be the theme that hit the latest movie premieres and industry events from NYC to Shanghai. Jennifer Lopez and Leighton Meester took their fashion know-how out of the states in a body-con number and a floaty confection, respectively, while Kourtney Kardashian fittingly bathed her bump in a feminine black baby doll dress. From Kate Beckinsale's thigh-grazing slit on her little black stunner to Cobie Smulders' floor-sweeping tangerine number, this week's looks have me wishing I had some red carpet events of my own to go to. Click through to see the top celeb looks of the week.

Kate Beckingsale wore a J. Mendel number and nude Nicholas Kirkwood heels to the Cancun photo call for her new movie Total Recall.

Jennifer Lopez attended a press conference at Boulevard3 Club in color-blocked, second-skin Lanvin with crystal snake wrap and Giuseppe Zanott ankle-strap pumps.

Kourtney Kardashian stepped out in a black Gomez-Garcia baby doll dress and neon accessories for the E! Upfront press conference in NYC.

Cobie Smulders turned heads at the Tribeca Film Festival in NYC in a tangerine Reem Acra gown with embellished cap sleeves, a Judith Leiber clutch and gold accessories by H. Stern and Ippolita.

Leighton Meester rocked a black lace and tulle Marchesa frock with satin pumps and Harry Winston jewels at the opening of two Harry Winston stores in Shanghai.

RALPH LAUREN GOES FOR THE GOLD WITH A 2012 TEAM USA OLYMPIC COLLECTION

Ralph Lauren unveils the closing ceremony uniforms for the nearly 800 athletes of the US Olympic team, which they’ll wear in London this summer. Mostly all white, Lauren’s latest collection consists of vintage-inspired polos, shirt-dresses, button-downs, sweaters and pants. Accessories include patriotic-inspired jackets, luggage, glasses, newsboy caps, booties, belts and beach towels. This marks the third time Lauren’s signature Americana sportswear has hit the Olympics. The designer outfitted the athletes in the 2010 Winter Olympics in Vancouver as well as the 2008 Summer Olympics in Beijing. Lauren’s involvement is part of an agreement between Polo Ralph Lauren and the US Olympic Committee. The Ralph Lauren 2012 Team USA Olympic Collection will go on sale online and in stores on May 15. Select pieces are on sale now at RalphLauren.com. Polo is reportedly paying 10 percent of royalties on sales of merchandise featuring the Olympic seal to the US Olympic Committee. The opening ceremony parade uniforms Lauren created for the US team will be revealed in July.