By Nakisha Williams
April 28, 2013 at 06:26 PM EDT
David M. Benett/Getty Images

This week on the red carpet, Gwyneth Paltrow bared her backside, Kiernan Shipka proved that she’s fashion wise beyond her years, and Lena Dunham brought her “girls” out to the TIME 100 gala.

Click on to see all of this week’s celebrity style highlights and — and questionable ensembles — and tell us how you’d rate the looks. 

At the Hollywood premiere of Iron Man 3, Gwyneth Paltrow played peek-a-boo in a revealing dress by Antonio Berardi.

NEXT: Kiernan Shipka

Mad Men star Kiernan Shipka attended the Chanel TriBeCa Film Festival Artists Dinner wearing a chic yet age-appropriate denim dress.

NEXT: Lena Dunham

At the Time 100 gala — where she was honored as one of the year’s most influential people — Lena Dunham took the plunge in a Saint Laurent dress.

NEXT: Christina Aguilera

Also at the Time 100 gala, Christina Aguilera showed off her curves in a black Victoria Beckham gown.

NEXT: Taraji P. Henson

Taraji P. Henson was to tie-dye for at the Chanel TriBeCa Film Festival Artists Dinner.

NEXT: Brad Goreski

There was no way to miss It’s a Brad Brad World star Brad Goreski in his highlighter yellow suit at the GLAAD Media Awards.

NEXT: Julie Bowen

Julie Bowen gave a flash of leg in a sheer LBD by Zuhair Murad at the Modernism opening night event in Los Angeles.

NEXT: Katy Perry

Katy Perry channeled Smurfette in a flirty Zimmerman frock and Jimmy Choo pumps at the Smurfs 2 party in Cancun, Mexico

NEXT: Josh Radnor

How I Met Your Mother star Josh Radnor suited up for the Chanel TriBeCa Film Festival Artists Dinner.

NEXT: Rosie Huntington-Whiteley

In London, Rosie Huntington-Whiteley worked a floral Michael Kors dress at a Vogue dinner held in the designer’s honor.

Read more:

On the scene at the Time 100 Gala red carpet

Fashion designer Michael Kors makes Time’s Most Influential list