Oscar-nominated actress Natalie Portman guest judges on this week's new episode of Bravo's "Project Runway," Wednesday, July 23 at 9 p.m. ET/PT.

After Jerry failed to wow the judges in the first episode, the remaining 15 designers are forced to think green in the second episode of "Project Runway"- with the help of their trusted models. Little do they know their eco-friendly designs will be judged by Portman.

In addition, on this week's episode of "Shear Genius," Wednesday, July 23 at 10 p.m. ET/PT, Life's a beach! The stylists must create a fun new look for laid-back surfer boys, giving them hair that compliments their lifestyle, both on and off the beach. The competition heats up during the elimination challenge as the stylists must use customized wigs to create a fashionable cut and style for prematurely balding women. Oscar Blandi (clients include Katie Holmes, Salma Hayek and Jessica Biel), one of the most sought-after stylists in the country, joins as guest judge.

-Check out a preview video of this week's "Project Runway" episode where Tim Gunn says: "It’s a pterodactyl out of a gay Jurassic Park."

-In this preview, the contestants really sweat.

-Natalie Portman Pictures