We’ve picked our Fashion A-List of the week! It was a week of white, and these five scene-stealing looks topped our list of favorites and secured top spots in our Look of the Day section: Cameron Diaz (in Roland Mouret), Rosie Huntington-Whiteley (in Chloe), Rose Byrne (in Emilio Pucci), Jessica Chastain (in Trussardi), and Nicole Kidman (in Giorgio Armani). Now that we’ve told you our faves, tell us yours by making your own Top 5 with InStyle.com’s new A-list tool. Visit instyle.com/instyle/a-list and pick your top five looks, then share your picks with your fashion-savvy friends on Facebook and Twitter. Head to the A-list maker right now to get started.