Sacre bleu! Is she sick!?

Marion Cotillard has been caught red-handed cheating on Christian Dior!

The longtime face of Lady Dior handbags attended the Chopard lunch at the Cannes Film Festival on Friday wearing a pink and ivory silk jacquard Vivienne Westood Couture corset gown.

This feels so…wrong. And not just because she's NOT in Dior, but because she wore that to lunch!

Only in Cannes!

P.S. Doesn't it look like the front of the dress accidentally got tucked into her panties??? Awks!

[Image via Getty Images.]

Well, it was fun for the few hours that itlasted.

Carey Mulligan went to her dark ways Thursday night at the IFP, Calvin Klein Collection & Euphoria Calvin Klein's Women In Film soiree in Cannes.

The Great Gatsby starlet was rather uninspiring in a strapless Calvin Klein LBD and black Brian Atwood sandals.

Just like Emma Watson, Carey kept the makeup to a minimum and pulled her hair back into a bun.

Sorry Carey, but this is doing absolutely nothing for us.

Can you PLEASE snap out of this Groundhog Day slump and give us something to ooh and ahh about? K, thanks.

[Image via Lia Toby/WENN.]

Are you surprised to see Rooney Mara at a Calvin Klein event? Ha!

The actress bit back her smile while walking the black carpet at the IFP, Calvin Klein Collection, and Euphoria Calvin Klein Women in Film celebration at Cannes on Thursday night.

The VAST majority of Rooney's past looks have been either black or white, or, in some cases, both, but this time we got to see her change it up ever so slightly.

She went nude!

Roons chose a delicate slip of a dress by the designer for the event, styling it with t-strap heels and tight bun.

Though pretty and ethereal, it's also rather forgettable.

We hope she wears something a bit more exciting next time!

[Image via Lia Toby/WENN.]

Nicole Kidman continued to make her obligatory Cannes jury member appearances on Thursday night by showing up to the IFP, Calvin Klein Collection & Euphoria Calvin Klein's Women In Film celebration.

Choosing a laser-cut leather dress from Calvin Klein's A/W 2013 collection, Nicole was elegant and edgy all at once.

No prize for guessing her shoes — that's right, they were Jimmy Choos! Rhyme totally unintentional.

We did notice, though, that the 45-year-old's eyes were kind of red.

Nobody said wearing expensive clothes and going to a bunch of fab events on the French Riviera was easy!

[Image via Lia Toby/WENN.]

Jennifer Lopez took a page out of Beyonce's tourbook for this one!

The singer performed her latest single Live It Up with Pitbull during the American Idol Finale Results Show on Thursday in a perforated white bustier top and flutter skirt worn with nude fishnets and gold gladiator sandals.

Reminds us of this look from Bey's Mrs. Carter Show World Tour!

Great minds think alike!

J.Lo shook and shimmied her famous derriere for Idol judges, who gave her a standing ovation.

Well, except for Mariah Carey. She remained seated.

Oh Mimi…

[Image via AP Images.]

Shawty had them Apple Bottom jeans (jeans), boots with the fur (with the fur)! The whole club was lookin' at hurrrr!

Admit it, you had the exact same thought when you saw this pic of Nicki Minaj at the American Idol Finale Results Show in El Lay on Thursday.

We'll say the good stuff first.

Her makeup and straight blonde wig are fierce and beautiful.

But those white jeans, perforated leather jacket, and ESPECIALLY those fur-ocious Christian Louboutin boots are better suited for a club in Siberia or something.

Just too much!

What do U think? Would Her Minajesty have been better off wearing baggy sweatpants and the Reeboks with the straps??? Bwahaha!

[Image via Brian To/WENN.]

Don't invoke the wrath of Rihanna!

Topshop has been selling a tank top with a picture of RiRi from her We Found Love music video (below) without her permission, and despite asking them repeatedly to halt sales of the item, the British retailer's refused.

The Barbadian diamond and her Reed Smith legal team even spent 8 month trying to negotiate an image-rights fee, "but they offered her $5,000 and said they don’t care", so now she's suing!

A source explained: