The stars hit the streets of Paris in full force this week for haute couture fashion week — but not everyone dressed to impress in the fashion capital of the world. Rosie Huntington-Whiteley and Olivia Palermo both wowed in Dior — while American embarrassment Kesha whooped it up stateside for the Fourth of July.

Rosie Huntington-Whiteley

It’s been one hot summer — but the ever-gorgeous Rosie Huntington-Whiteley looks effortlessly cool in a collared plaid romper by Dior prior to the fashion house’s 2015-2016 fall/winter haute couture collection show in Paris.

Olivia Palermo

Not everyone can pull off a boxy frock with a plunging, squared neckline, but then again, Olivia Palermo isn’t just anyone. The fashionable socialite rocks the head-to-toe Christian Dior ensemble prior to the Schiaparelli show in Paris.

Ciara

The singer may be abstaining from sex with her new boyfriend Russell Wilson, but that doesn’t mean she’s shy about showing off her smokin’ bod. Ciara turns heads in this purple gown at the Kensington Palace Summer Gala to raise funds for the care of the Royal Ceremonial Dress Collection in London.

Alexa Chung

The nipple may still be banned on Instagram, but it stars front and center on Alexa Chung’s Christopher Kane dress at the Serpentine Gallery summer party in London — and if you look closely, there’s even a hint of scrotum.

Kesha

Wake up in the morning feelin’ like Betsy Ross — that’s how the song goes, right? The glitter-loving singer sports an American flag over a Harley-Davidson tank and bejeweled jorts at the Hard Rock Hotel & Casino at the resort’s Rehab pool party in Las Vegas.

Charli XCX

It appears that the pop star cut two equally awful dresses down the middle and stitched them together to form one monster frock. The voluminous dress — not to mention the matching flip-flops — are an eyesore at the Viktor & Rolf Flowerbomb fragrance 10th anniversary party at Paris haute couture fashion week.

Lily Collins

Mullet frocks are so 2013, Lily. The “Love, Rosie” actress’ matronly Mikael D gown wins her zero style points at the Lancôme 80th anniversary party during Paris haute couture fashion week.

Cara Delevingne

Did the “Paper Towns” star get tangled in a fishing net prior to her red carpet appearance at the film’s Australian premiere? Cara Delevingne’s Dion Lee dress is Nemo’s worse nightmare — plus she looks to have a nasty case of pinkeye.

Russian model Irina Shayk stunned in a crimson Versace dress, which she paired with matching red lips, shoes and clutch for the Vogue Paris Foundation on Monday — while Rita Ora gave the same dress the “Pretty Woman” treatment, complete with thigh-high boots, for Wednesday’s “X Factor” auditions.