Fab or flop: Rita Ora's disco dress, Olivia Palermo's white lace and more

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Fab or Flop: Week of June 10
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Fab or Flop: Week of June 10

Flop: Woah, there! TV personality Erica Mena left very little to the imagination in a totally see-through silver tunic that put her bust on full display.

(Photo by David Livingston/Getty Images)

Fab: Rita Ora looked like a modern disco queen in a sexy short-sleeved silver minidress and silver platform sandals. Glam makeup and pinstraight locks completed her hot look. (Similar dress here.)

(Photo by Robert Kamau/GC Images) 

Flop: Nastia Liukin slipped into a revealing black minidress with cutouts at the hipbones and a futuristic bustier bodice, but the look ended up looking more tacky than sexy.

(Photo by JB Lacroix/Getty Images)

Fab: Kendall Jenner wowed in a black satin bralette, high-waisted paints and a choker. (Similar bralette here.)

 (Photo by Jason LaVeris/FilmMagic)

Flop: Kristen Stewart's avant-garde Chanel gown should have remained on the runway. The blouson sleeves, leather cuffs and ruffled skirt weren't totally wearable.

(Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)

Fab: Olivia Palermo was a statuesque beauty in a gorgeous white pleated Self-portrait Amelia midi dress with delicate lace accents. A necktie and heels added an extra touch of polish.  

(Photo by John Lamparski/WireImage)

Flop: AnnaLynne McCord looked ready for her Winter Olympics close-up in a figure skater-esque floral cape dress and mismatched nude heels.

(Photo by Jason LaVeris/FilmMagic)

Fab: Kristen Stewart looked killer in a white pantsuit with a simple white T-shirt underneath. Black and white loafers completed her sleek, fashionable ensemble. (Similar shoes here.) 

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Flop: Zendaya looked a bit outdated in a gold taffeta tube top with a massive bow and shiny leather skinnies.

 (Photo by Jeffrey Mayer/WireImage)

Fab: Kristen Stewart nailed it again and put her toned legs on display in denim cutoffs, a white tee, gray blazer and black brogues. (Similar jacket here, shoes here.)

(Photo by Alessio Botticelli/GC Images) 

Flop: JWoww totally overdid it with too much leather -- a leather pencil skirt, leather jacket and leather booties.  

(Photo by Steve Mack/WireImage)

Fab: Alicia Vikander looked effortlessly sexy in a simple belted black midi dress, black and white sandals and undone hair. (Similar dress here.)

(Photo by Neil Mockford/GC Images) 

Flop: Bella Hadid looked a bit over-the-top leaving the gym in totally unrelatable athletic wear.

 (Photo by Alo Ceballos/GC Images)

Fab: Sister Gigi Hadid looked effortlessly chic in cropped jeans, a simple white tee and black slides. A red bag and lips matched her mani-pedi. (Similar sandals here.)

(Photo by James Devaney/GC Images) 

Flop: Kendall Jenner's tiny frame was totally overwhelmed by her oversized pants and huge cropped sweater.

(Photo by James Devaney/GC Images)

Fab: Meghan Markle looked chic and sophisticated in a striped Veronica Beard shortsuit and nude heels.

(Photo by Ray Tamarra/GC Images) 

Flop: Rita Ora looked totally ridiculous and kitschy in an oversized rainbow jersey, tie-dye socks, white tennis sneakers and a white visor.

(Photo by James Devaney/GC Images)

Fab: Actress Kristen Wiig looked fun in a flirty midi dress with a scalloped neckline and whimsical, dotted strawberry print by Victoria Beckham

(Photo by Raymond Hall/GC Images)

Flop: Busy Philipps looked frumpy in a potato sack-esque denim dress and Birkenstocks.

(Photo by Alo Ceballos/GC Images)

Fab: Heidi Klum looked killer in a flirty halter dress with a black bodice and floral printed, ankle-length skirt. A high ponytail, clutch and simple black sandals completed her knockout look.

(Photo by Robert Kamau/GC Images)

Flop: Rita Ora is red hot, but her outfit, complete with outrageous ruffled sleeves, was not.

 (Photo by Alo Ceballos/GC Images)

Fab: Samira Wiley looked killer in a gorgeous silk jumpsuit with a fun, summery floral print. Matching navy pumps and mirrored sunnies completed her gorgeous look.

(Photo by Ray Tamarra/GC Images)

Flop: We're not sure what Olivia Culpo was thinking when she chose this floral, fringed mess of a top.

(Photo by Michael Stewart/GC Images)

Fab: Reese Witherspoon looked absolutely adorable in a fun pink minidress, white heels and a white fedora.

(Photo by BG001/Bauer-Griffin/GC Images)

Flop: Jessica Szohr missed the mark in low-slung bermuda shorts and a slouchy jacket. Mismatched, bow-adorned pumps didn't do the trick, either.

(Photo by JB Lacroix/WireImage)

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The dog days of summer are here and celebrities turned up the heat in hot styles!

Rita Ora looked like a modern disco queen in a sexy short-sleeved silver minidress and silver platform sandals. Glam makeup and pinstraight locks completed her hot look. (Similar dress here.) Olivia Palermo was a statuesque beauty in a gorgeous white pleated Self-portrait Amelia midi dress with delicate lace accents. A necktie and heels added an extra touch of polish.

Even Kendall Jenner, who covered up in high-waisted, wide-legged black slacks and cardigan added a sexy, stylish twist with a black satin bralette. (Similar here.)

SEE ALSO: Sexy Stars: Diane Kruger, Alicia Vikander and more stun in sultry looks

But while some stars totally shined, others missed the mark.

TV personality Erica Mena left very little to the imagination in a totally see-through silver tunic that put her bust on full display. Nastia Liukin slipped into a revealing black minidress with cutouts at the hipbones and a futuristic bustier bodice, but the look ended up looking more tacky than sexy. And AnnaLynne McCord looked ready for her Winter Olympics close-up in a figure skater-esque floral cape dress and mismatched nude heels.

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

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