Straight off the runway: Leighton Meester

source: TFS, style

ID that dress: Kate Winslet

You can purchase Kate's dress online at www.net-a-porter.com:
Narciso Rodriguez Sleeveless wool dress $1800

source: justjared, celebutopia

ID that jacket: Nicole Richie

You can purchase Richie's coat online at www.edressme.com:
Double Breasted Short Coats from Sonia by Sonia Rykiel $532

source:love-richie.com