The Best-Dressed Stars This Week: 8/30/13

From Ali Larter in Marchesa to Lily Collins in Rachel Zoe—these are the chicest celebs this week!

Only Lily could make stripes look this sophisticated. I've been dying over her Mortal Instruments press tour looks, but this Rachel Zoe top just takes things to another level!

Très belle! Emmy Rossum was looking very Parisian-inspired at the release of Ali Larter's new cookbook "Kitchen Rivalry" wearing a black long sleeve top with white beading from the Moschino Cheap + Chic PreFall 2013 collection.

And speaking of Ali, she was gorgeous in Marchesa at her event.

Sandra Bullock brought a bright, color-blocked pop of color to the red carpet during a photocall for Gravity on the opening day of the 70th Venice Film Festival.

Jordana Brewster attended the unveiling of Vin Diesel’s star on the Hollywood Walk Of Fame wearing a black and white ensemble and Carla Amorim Floating ring in 18k yellow gold with black quartz. Hotness.com.

How cute was Jaime Chung in Ann Taylor's 'Leopard Jacquard Flounce Skirt' and Parker 'Jeri' tank at Ali Larter's book party?! Need this outfit—NOW.

It doesn't get much better than Olivia Palermo in a Catherine Malandrino for Kohl’s DesgiNation cut-out shift dress (The collection launches in Sept.)

Kate Walsh stunned at the Comedy Central Roast of James Franco in a fitted, floral frock. That body though...

Donning the "it" color for fall—wine—Emily VanCamp was every bit a style star at her Nylon Magazine Cover Party.