Khloe Kardashian and Britney Spears’ X-Factor Fashion Faceoff and More Star-Studded Style Showdowns (GALLERY)

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This week’s style motto: “Great minds think alike.” That, or middle school-style matching is making a comeback.

At an X Factor finalists party on Monday night, Khloe Kardashian proved she’s already in sync with the show’s judges, donning a nearly identical LBD to that worn by Britney Spears and sporting a bright red pout like Demi Lovato’s.

But the ladies of the X Factor weren’t the only celebs playing the matching game this week. On the other end of the style spectrum, Olivia Wilde and Julianne Moore were a couple of fashion copycats in ethereal white dresses.

So who won this week’s style showdowns? We’re breaking down the matchy-matchy celeb styles — and then it’s your turn to weigh in.

Kicking off our style showdown: the X Factor fashion faceoff, with Kardashian and Spears in matching LBDs and Kardashian and Lovato in coordinating crimson pouts.

Kardashian showed off her svelte new figure in a long-sleeve black mini dress by Skaist Taylor. The reality star amped up the simple LBD with sleek accessories, including drop earrings from BaubleBar and shiny, pointy-toed pumps.

While Spears’ LBD was so similar to Kardashian’s that we did a double take, there were a few notable differences in the X Factor stars’ looks. Spears opted for a ruched style with a  slightly longer knee-length hemline and exposed zippers on the sides. Like Kardashian, Spears kept it simple, nixing the jewelry and coordinating her footwear to her dress in black strappy sandals.

Though both stars sizzled in the similar sexy styles, the knee-length hemline of Spears’ LBD truncated the pop star’s frame, while Kardashian’s shorter hemline made her long legs appear even longer for an overall slimming effect.

Kardashian’s on-trend red lips also won our vote over Spears’ nude lips. But Lovato and Kardashian prove that red lips really are the new neutral — looking equally as chic when contrasted against Kardashian’s all-black ensemble and when coordinated with Lovato’s red dress.

Now, to the site of Monday’s other style showdown, the Ace Awards in New York City, where Wilde and Moore matched in belted white ladylike looks.

Wearing Calvin Klein, Wilde looked incredibly chic in a belted peplum style. Also in Calvin Klein, Moore, too, sported a shiny white below-the-knee style with a skinny black belt, causing us to wonder if the two stars called each other to coordinate beforehand.

This red carpet battle was almost too chic to call. We loved both stars’ chic belted LWDs, as well as how they each chose the most flattering style for their shape and age. But Wilde’s black snakeskin clutch and black pumps, both by Vince Camuto, which coordinated with the dress’ built-in belt, helped her to narrowly beat her chic competition. While Moore’s off-the-shoulder sheath exuded sophisticated elegance, her platform sandals and white chain clutch felt out-of place.

We’ve shared our winners for this week’s fashion faceoff. Now it’s your turn to weigh in: Check out the star-studded style showdown here and share your picks below.

See our fashion experts weigh in on more celebrity fashion copycats on The Daily Buzz.

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