Fab or flop: Emma Roberts' minidress, Ruby Rose's leather skinnies and more

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Fab or Flop: Week of Jan. 10
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Fab or flop: Emma Roberts' minidress, Ruby Rose's leather skinnies and more

Fab: Emma Roberts

Emma Roberts looked super chic in an adorable gray tweed minidress with a flirty hem layered over a long-sleeved black tee. Sheer tights, black brogues and a black crossbody bag completed her sophisticated-yet-quirky ensemble. 

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

Flop: Chloe Grace Moretz

We love Chloe Moretz, but we were not on board with this mismatched outfit. Individually, the pieces might have worked great -- but altogether, it became a bit of a mess, especially when factoring in her matronly heels. 

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

Fab: Ruby Rose

Ruby Rose is having a total moment right now, and her style is perfect for the spotlight. You can never go wrong with leather skinnies, a band T-shirt and sleek blazer! Mirrored sunnies and a chain necklace only added to the "Orange is the New Black" star's cool factor. 

(Photo by SMXRF/Star Max/GC Images)

Flop: Rumer Willis

The "DWTS" alum has had many fashion wins in the past, but this look was a total miss. While the dress, jacket and bag totally work, the heavy black boots detract from the flirty look. 

(Photo by Bauer-Griffin/GC Images)

Fab: Heather Graham

Graham could arguably look great in anything, but the actress definitely hit a high note in this simple, colorblocked midi T-shirt dress and caged booties. 

(Photo by Raymond Hall/GC Images)

Flop: Kelly Osbourne

We're all for mixing styles, but Osbourne seems to have tried a little too hard to achieve that eclectic sartorial look. The former "Fashion Police" host missed the mark in her floral skirt and black and white brogues. 

(Photo by JMA/Star Max/GC Images)

Fab: Hilary Duff 

Wow! The "Younger" star totally stunned in a sexy red minidress and silky white topcoat. Sexy nude sandals completed her knockout look. 

(Photo by Alo Ceballos/GC Images)

Flop: Kesha

We've been loving Kesha's grown-up, sophisticated style as of late, but the singer took a few steps back in this too-short jacquard minidress and tacky silver heels. 

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

Fab: Olivia Munn

We are obsessing over Munn's sultry take on classic businesswear. The actress looked on point in a gray tank and wide-legged trousers that cinched in her tiny waist. 

(Photo by Robert Kamau/GC Images)

Flop: Khloé Kardashian

She may be looking better than ever, but a skintight animal print jumpsuit might be best saved for Halloween. 

 (Photo by Robert Kamau/GC Images)

Fab: Olivia Palermo

Street style favorite Olivia Palermo nailed effortlessly casual-cool style in leather skinnies, sneakers and an awesome black wool coat.

(Photo by Alo Ceballos/GC Images)

Flop: Molly Sims

Molly Sims had just a little too much going on -- the grandpa sweater wasn't doing much for her pretty dress, and the blue plastic sunnies even less so. 

(Photo by Bauer-Griffin/GC Images)

Fab: Margot Robbie  

Robbie killed airport fashion in ripped boyfriend jeans, cute slip-ons and a sharp overcoat. A trendy backpack and mirrored sunnies completed her effortless ensemble. 

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

Flop: Kendall Jenner

They say if you got it, flaunt it -- but If it's chilly enough for a fur-lined leather jacket, it probably isn't appropriate to rock a sports bra, too. 

(Photo by Michael King/BuzzFoto via Getty Images)

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This week, Emma Roberts totally gets an A+ for her flawless school uniform-esque ensemble. We're in love with it all, from her gray tweed minidress layered over a simple black long-sleeved tee to her black patent brogues and trendy sunnies.

The "Scream Queens" star wasn't the only one to turn heads on the street -- Ruby Rose, Hilary Duff and Margot Robbie are all among this week's street style winners with their simple, effortless ensembles with a chic payoff.

SEE ALSO: Sexy Stars: Olivia Munn, Khloé Kardashian and more stun in sultry looks

Chloe Moretz, Rumer Willis and Kelly Osbourne were among this week's style losers. One thing they all had in common was a little too much look. Mismatched outfits can lead to sartorial genius, but only if effortless and not overthought. Osbourne was definitely guilty of overthinking her LA outfit -- pairing her gauzy floral skirt with black and white shoes just didn't work.

Click through the slideshow above for celeb looks this week that we thought were fab ... And others we deemed a total flop.

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