The Slimming Styling Trick Rosie Huntington-Whiteley Loves www.whowhatwear.com

On Huntington-Whiteley: Jimmy Choo Andie Glitter-Trim Round Sunglasses ($460); Isabel Marant Roxana Frayed Woven Linen-Blend Mini Dress ($750/$263); Saint Laurent Monogramme Croc-Effect Leather Clutch ($1290); Gianvito Rossi Brooklyn Suede Ankle Boots ($1225).