Knightley updated the little black dress at the launch of Asprey's new London store.
For a Baverly Hills Prada store opening, Barton picked a full-skirted, pleated Prada dress.
Looking runway-ready in Versace, Zeta-Jones took in the designer's spring fashion show in Milan.
The bodice-conscious actress wore a Louis Vuitton dress at the Cannes Film Festival.
At the Manhattan premiere of Vanity Fair, the film's star set off her newly brunette hair with a coral chiffon Alberta Ferretti.
The I, Robot actress picked a formatting Narciso Rodriguez halter dress for the film's L.A. premiere.
The Anchorman actress slipped into a sequin-and-chiffon Blumarine for a Hollywood awards gala.
The best actress nominee went strapless to the SAG Awards in a Roland Mouret corset dress.
Portman made a winning choice with a dress from Zac Posen, who earned high honors at the CFDA Awards.
Tamblyn showed a flare for style in a tea-length Monique Lhuillier at the People's Choice Awards.
At an L.A. premiere, Newton joined a Miu Miu dress with a Prada clutch arid shoes.