Fab or flop: Nina Agdal's jeggings, Rose Byrne's mauve dress and more

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Fab or Flop: Week of April 17
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Fab or flop: Nina Agdal's jeggings, Rose Byrne's mauve dress and more

Flop: Nina Agdal

The Sports Illustrated model, 24, left little to the imagination in acid-wash jeggings that should have been left behind in 2007. 

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Fab: Rose Byrne

The "Neighbors" actress stunned in a gorgeous mauve and purple floral midi dress, matching heels and chic sunnies. 

(Photo by Team GT/GC Images)

Flop: Chloe Sevigny

Woah! The actress, 41, looked wild in an ornamental leather minidress, leather jacket and leather booties. Lace tights only made the dizzying ensemble more of a visual headache. 

(Photo by Gilbert Carrasquillo/FilmMagic)

Fab: Rebecca Romijn

The gorgeous actress, 43, flaunted her enviable bod in tasteful leather leggings, a cropped black turtleneck sweater and sexy pointed stilettos.  

(Photo by Raymond Hall/GC Images)

Flop: Kendall Jenner

The supermodel, 20, fudged the athleisure trend in a frumpy, tan and maroon tracksuit that looked straight out of a high school gymnasium. Pointy stilettos and a black leather bag negated the sporty look.

 (Photo by SMXRF/Star Max/GC Images)

Flop: Iggy Azalea

Iggy Azalea, 25, looked like she stepped out of a secondhand store in a frumpy ensemble that looked like hospital scrubs.

(Photo by GVK/Bauer-Griffin/GC Images)

Fab: Sienna Miller

The actress, 34, stunned in a casual navy wide-legged cropped pants, a simple gray T-shirt and on-trend baby blue mules. A navy leather bag pulled the effortless look together perfectly. 

 (Photo by Raymond Hall/GC Images)

Flop: Megalyn Echikunwoke

The "CSI: Miami" actress, 32, looked like a referee in a gaudy black and white striped buttondown and shiny black slacks with pink stripes down the sides. 

(Photo by Taylor Hill/Getty Images,)

Fab: Nadja Bender

The Danish model, 25, looked ultra chic in cropped tweed gauchos, a black and white printed buttondown and sexy lace-up heels. Nude makeup and undone hair completed her flawless ensemble. 

(Photo by Gary Gershoff/WireImage)

Flop: Mamie Gummer

The "Good Wife" actress, 32, looked ready for a festival, not Tribeca Film Festival, in a sheer leopard maxi skirt, rocker tee and cross-body bag.  

(Photo by Andrew Toth/Getty Images for 2016 Tribeca Film Festival)

Fab: Gwen Stefani

The former "Voice" judge wowed in her signature look -- skinny jeans, a sheer white buttondown and funky booties.

(Photo by Bauer-Griffin/GC Images)

Flop: Blac Chyna

The soon-to-be Kardashian, 27, missed the mark in technicolor leggings, a sweatshirt, slide-on slippers and baseball cap.

(Photo by Bauer-Griffin/GC Images)

Flop: Gina Gershon

The "How To Make It In America" actress, 53, looked silly in a Canadian tuxedo with a capri-length pant leg. 

 (Photo by Josiah Kamau/BuzzFoto via Getty Images)

Fab: Sarah Jessica Parker

Less is more! The actress, 51, wowed in jeans, a simple sweater and metallic booties. 

(Photo by Bryan Bedder/Getty Images for #ActuallySheCan)

Flop: Nastia Liukin  

The Olympic gymnast, 26, rocked a strange orange skirt with a floor-length front panel that begged comparison to a loincloth.

(Photo by Craig Barritt/Getty Images for AT&T)

Fab: Julia Restoin Roitfeld

The model, 35, wowed in a gorgeous white halter gown and black sandals. 

(Photo by Gilbert Carrasquillo/FilmMagic)

Flop: Arden Wohl

Here's a risk that didn't pay off. The director rocked a flowy peach gown that matched her skin tone perfectly.  

(Photo by Gilbert Carrasquillo/FilmMagic)

Fab: Sara Sampaio

The Victoria's Secret model, 24, wowed in an adorable minidress with blouson sleeves and a ruffled neckline. 

(Photo by Bryan Bedder/Getty Images for #ActuallySheCan)

Flop: Rose Byrne  

Byrne's '50s inspired updo totally clashed with her sequined dress -- and her gold heels stook out like a sore thumb.

(Photo by Taylor Hill/Getty Images,)

Fab: Jessica Chastain

The actress, 39, looked perfect in a gorgeous red embroidered short-sleeved tea dress and nude heels. 

(Photo by Raymond Hall/GC Images)

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Remember jeggings?

Nina Agdal sure does. The Sports Illustrated model dusted off the 2007 staple while out and about this week -- and we wish she left it in the closet. The 24-year-old left little to the imagination in skintight, outdated acid-wash jeggings.

Rose Byrne, on the other hand, stepped out this week in an easy, breezy -- and totally chic -- mauve printed midi dress and matching heels. A chic lob and sunnies completed her sophisticated look. Rebecca Romijn, 43, also turned heads this week when she flaunted her enviable bod in tasteful leather leggings, a cropped black turtleneck sweater and sexy pointed stilettos.

See these looks and more in the slideshow above.

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