
Emmy Rossum and Nina Dobrev Rock the Young Hollywood Book Launch Party—Plus More Best-Dressed Moments!

Jan. 28 2015, Updated 2:40 p.m. ET

We get psyched every time we see a celeb rock a suit during photocall. At the Michael Kors hosted Claiborne Swanson Frank’s Young Hollywood Book Launch event, Julianne Hough surprised us with this printed red set that fit like a glove.

Actress Abigail Spencer really went for it in her bright yellow long-sleeve shift and added even more color with a red lip. It was bold—and it worked.

Emmy Rossum is really kicking it up a notch! The actress, who recently appeared on the cover of Cosmo in a sexy LBD, attended the star-studded event in a sultry deep-V dress that was balanced with a mid-length skirt.

Aubrey Plaza, a girl on the border of style icon status, showed some leg in a structured little white mini accented with ruffles.

What caught Nina Dobrev's eye? A white lace body-con that hugged her curves perfectly. Think we'll see Kim K in this masterpiece soon?

Rachel Zoe looked like a goddess in her white one-shoulder gown and gold accessories. Her style is divine!
Zoë Kravitz

Zoë Kravitz brought back the best of 90s red carpet fashion in a black floor-length slip dress.

Amber Valletta's shoes totally made this outfit. Just look at them!

Nicole Richie’s little sis has style! Sofia Richie's white pantsuit was truly a win.

Hailee Steinfeld, clad in a girly dress with 70s vibes, posed with the famous host himself—Michael Kors!

Yes, a crop top was in attendance! New Girl's Hannah Simone wore a black pencil skirt with a matching black sleeveless midriff-baring blouse.
harley viera newton

We're used to seeing DJ Harley Viera Newton in edgy ensembles, so this girly girl moment was a total (and pleasing!) shocker.

The hue of Holland Roden's dress complemented her rich hair color SO well.

At 14-years-old, Mad Men's Kiernan Shipka has already become one of the best-dressed women in Hollywood. Here's another outfit for the books!

A brave Alison Brie attended the event in a see-through shirt that gave the world a peek at her undergarments, specifically her bra!