The Best-Dressed Celebs This Week: 9/20/13

From Gwyneth Paltrow in Lanvin to Gwen Stefani in L.A.M.B.—these are the stylish stars that wowed both on-and-off the red carpet this week.

Stacy Keibler paired her vampy lip with a Pamella Roland LBD for The Hollywood Reporter’s Emmy Party. Muy caliente!

Oh hello, Cate Blanchett! You gotta love a Prabal Gurung ostrich-feather skirt moment.

Talk about straight off the runway! Heidi Klum loved Donna Karan's SS14 collection so much, she wore her one-shouldered, embroidered, block-print dress to the America's Got Talent Season 8 premiere just days after Karlie Kloss rocked it at New York Fashion Week.

Gwyneth Paltrow was white hot in Lanvin at the Thanks for Sharing premiere!

Jamie Chung looked super-cute in a colorful Parker dress at the LIVELOVESPA.COM SPLASH! event yesterday at the Spa at The Hyatt Regency Century Plaza. Loving those sandals too!

Gemma Arterton opted for a figure-flattering Burberry Prorsum gown and Amrapali jewels to the Runner Runner premiere.

Nicky Hilton killed it in red lacy Valentino at the 11th BrazilFoundation NYC Gala.

I'm not usually a fan of Jessica Biel's style, but she shut it down in this menswear-inspired look at the premiere of her hubby's new movie, Runner Runner.

A bad gal-approved look. Rihanna sported white separates for her #RiRiHeartsMAC event in Hong Kong.

Gwen Stefani WOULD wear this to a kid's birthday party in LA. Living for her in a bold, matchy-matchy outfit designed by...herself.