What happened to the California Gurl? Katy Perry looks fierce as she channels mean and moody at Paris Fashion Week

She's known for singing her bubbly pop tunes and wearing colourful costumes on stage but Katy Perry has changed.
The 27-year-old singer has modelled somewhat of a more sophisticated look while spending time in Paris during Fashion Week.
Today, she arrived at the Yves Saint Laurent Autumn/Winter show and there wasn't a bright colour or a hint of a smile in sight.

Mean and moody: Katy Perry fails to crack a smile as she arrives at the Yves Saint Laurent Autumn/Winter 2012 show in Paris today

Instead, the U.S. star appeared to be channeling the mean and moody look as she posed with her hand on her hip inside the French venue.
Wearing a short green dress, with thigh-high leather boots and a matching biker jacket, Katy looked every inch the fashionista as she stared into the camera.

 

Her flawless skin was on show as she had her blue hair pulled back into a severe bun and her eyes stood out in lashings of black eyeliner.

Different look: The singer wore dark make-up and pulled her blue hair back into a bun

Not so bright: Katy's black and green look was in stark contrast to the blue outfit she wore to the Viktor and Rolf show at the weekend

The old Katy: The singer is well-known for the girly and colourful costumes she wears onstage

She completed her look with a chunky gold necklace and a matching cuff bracelet and carried a grey box clutch bag as she made her way inside.
Even as she took her place in the front row, Katy still couldn't bring herself to smile.
It was a far cry from the previous day when she flashed a grin while shopping and visiting museums in the French capital.
However, today she was surrounded by other famous females who were more than happy to grin for the cameras.

Ladies in black: Rosario Dawson (L) brightened up her outfit with red lipstick while Alicia Keys completed hers with a fur jacket

First up was U.S. actress Rosario Dawson who looked stylish in a knee-length black shift dress and matching boots.
The Zookeeper star brightened up her outfit with birght red lipstick and wore her dark hair up with a plait decorating the front of her head.
Also dressed in black was singer Alicia Keys who hid her slender figure underneath black loose-fitting trousers and a low-cut top.

Hollywood glamour: Salma Hayek looked stunning in a tan leather skirt and a sleeveless blouse

It's a date! The actress sat in the front row with her French husband Francois-Henri Pinault

She draped a white fur coat across her shoulders and completed her look with a pair of peep toe heels.
Salma Hayek, on the other hand, steered clear of dark colours and teamed a tan leather skirt with a grey sleeveless blouse.
She too wore a hint of red lipstick and looked every inch the movie star as she sat cross-legged in the front row with her husband, French businessman François-Henri Pinault.

Ladylike: Nicole Kidman was pictured arriving at the Tod's private dinner party at Fashion Week

STEFANO'S SWANSONG: PILATI'S DARK FAREWELL TO YVES SAINT LAURENT

Emotions were high as Stefano Pilati bid adieu to Yves Saint Laurent, just a week after the house announced his departure as creative director.
Talk that the company was looking to replace the designer for some months was one of fashion’s worst kept secrets.
The collection was stronger and sharper than last season. Perhaps fittingly, it channelled black — the colour of mourning — and chainmail, redolent of combat and self-defence.

Dark arts: Stefano Pilati's final collection for Yves Saint Laurent channelled black — the colour of mourning — and chainmail, redolent of combat and self-defence

Fatalistic: The seeming lightness of the materials diluted the fierceness of the clothes. The last piece, a 1970s tuxedo (right), was a single nod and direct tribute from Pilati to the late, great Yves Saint Laurent

From the outset, a tangibly fatalistic mood hovered in the air: the first model strode slowly down the 100-metre (328ft) catwalk in a simple black hood.
But the seeming lightness of the materials diluted the fierceness of the clothes: Sharp-shouldered silhouettes with cinched waists managed to have an element of fragility.
A long black coat could have been inspired by the Matrix, but had the feel of a kimono and a softness in the leather. A chainmail dress looked delicate — like the skin of a fish — later echoed with finesse in chainmail printing.

Standing ovation: Fashion's finest took to their feet at the end of the show as Mr Pilati took his bow

A subdued mood with slimmer forms replaced the free volumes of previous seasons. Also gone were the palazzo pants and the Prince of Wales check of last fall, and with it most of the house’s DNA.
'Stefano has given them lot of iconic things,' said actress Salma Hayek, on hand for the show. 'This show was a homage not to the house, but to himself.'
The last piece was the exception that proved this rule. A gorgeous 1970s tuxedo suit, a single generous nod and direct tribute from Pilati to the late, great Yves Saint Laurent.