Fab or flop: Kim K.'s bike shorts, Rihanna's floral dress and more

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Fab or flop: Week of May 29
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Fab or flop: Kim K.'s bike shorts, Rihanna's floral dress and more

Flop: Kim Kardashian looked silly in a pair of unflattering bike shorts with an empire-waist that totally cut her off and failed to complement her slimmed-down, post-baby bod. Otherwise, the red heels, studded moto jacket and ponytail look fab.

(Photo by Light Brigade/Bauer-Griffin/GC Images)

Fab: Emma Roberts looked chic in black skinnies, booties a white cropped sweater and black jacket.

(Photo by Neil Mockford/Alex Huckle/GC Images)

Flop: We'll give Robyn props for flaunting her personal style, but we still can't get behind this ruffled, mismatched jumpsuit monstrosity she donned.

(Photo by Andrew Toth/FilmMagic)

Fab: Rihanna looked incredible in a simple midi dress with artistic flower details. Stella McCartney platforms and hoop earrings completed her incredible summer ensemble.

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Flop: Julia Stiles was ultra-drab in a dull tie-dye maxi skirt and printed short-sleeved buttondown.

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Fab: Olivia Palermo wowed in a camel pinstripe jumpsuit, navy pointy flats and a navy blazer.

 (Photo by Gardiner Anderson/Bauer-Griffin/GC Images)

Flop: Salma Hayek looked costume-y in a brocade dress with Victorian accents. Her way-too-high T-strap platform heels added a garrish touch.

(Photo by Karwai Tang/WireImage)

Fab: Kate Bosworth turned heads this week in a gorgeous nude tea dress with an eye-catching sheen. The ruffled skirt offered a ladylike vibe to the more structure, bustier-esque bodice. A swipe of red lipstick added a pop of color.

(Photo by Gary Gershoff/WireImage)

Flop: Meghan Trainor looked frumpy in a tight black dress, hoofish booties and a brown bomber jacket.

 (Photo by Marc Piasecki/GC Images)

Fab: Megan Fox flaunted her baby bump in a form-fitting bodycon dress with sexy buttons down the side seams. Fresh curls, strappy sandals and red lips completed her knockout look.

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

Flop: Kendall Jenner was dressed for the wrong season in maroon corduroy pleated pants and a silk duster.

 (Photo by Light Brigade/Bauer-Griffin/GC Images)

Fab: The model redeemed herself in this downtown-cool ensemble that consisted of light denim, black heeled booties and a cute cropped white jacket with black military-esque details.

 (Photo by Bauer-Griffin/GC Images)

Flop: Kat Graham's sexy ensemble would have been a hit without the outrageous feathered sleeves.

(Photo by wow/Star Max/GC Images)

Fab: Rosie Huntington-Whiteley looked chic and sophisticated in black skinnies, a black one-shoulder top and heels. Mirrored sunnies, a casual ponytail and black clutch completed her effortless ensemble.

 (Photo by Bauer-Griffin/GC Images)

Flop: Actress Judy Reyes looked silly a bra-exposing mint dress. The look would have been absolutely adorable without the tacky black lace bustier!

(Photo by Kevin Winter/Getty Images)

Fab: Emma Roberts looked sophisticated and elegant in a cold-shoulder navy minidress, fun ankle-strap heels and a tiny bag.

(Photo by Mike Marsland/Mike Marsland/WireImage)

Flop: We're all for mixing and matching, but Kendall Jenner missed the mark in gunmetal pleated disco pants and a casual rocker tee layered over a lace crop top.

(Photo by wow/Star Max/GC Images)

Fab: Alessandra Ambrosio chose a look -- and committed to it. We love her easy, breezy California-style denim skirt, muscle tank and sneakers.

(Photo by wow/Star Max/GC Images)

Flop: "Jane the Virgin" actress Yael Grobglas failed to impress in loud, pinstripe skinnies.

(Photo by Jason LaVeris/FilmMagic)

Fab: Ashley Tisdale looked absolutely adorable in retro-inspired jeans, chunky mustard platforms and a simple mock-neck sweater.

(Photo by Noel Vasquez/Getty Images)

Flop: We're not sure what Paris Hilton was thinking when she slipped into a tight purple maxi dress, red crop top and ballet flats.

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

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Fab or flop? Kim Kardashian looked silly in a pair of unflattering bike shorts with an empire-waist that totally cut her off and failed to complement her slimmed-down, post-baby bod. But otherwise, her red heels, studded moto jacket and ponytail were totally fab. Emma Roberts, on the other hand, was undeniably chic in black skinnies, booties a white cropped sweater and black jacket. It was a simple look, but sometimes, less is more!

SEE ALSO: Sexy Stars: Gigi Hadid, Suzanne Somers and more rock revealing looks

While we appreciate the efforts of fashion risk-takers, like Robyn, we just can't get behind the ruffled, mismatched jumpsuit monstrosity she donned this week. Rihanna tends to take risks that pay off -- and she looked incredible this week in a simple midi dress with artistic flower details. Stella McCartney platforms, hoop earrings and mirrored sunnies completed her incredible summer ensemble.

See this week's best and worst dressed in the slideshow above.

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