Fashion week is an event that allows fashion designers or “houses” to display their latest collections in runway show. This year too, Fashion Week in Milan, New York, Paris, and London presented the spring/summer 2011 fashion collections.

Fashion icon and fashion regular Alexa Chung attended the Miu Miu Ready to Wear Spring/Summer 2011 show during Paris Fashion Week on October 6, 2010 in Paris, France showing a girly style with a check dress with white collar and cuffs. At the Valentino Ready to Wear Spring/Summer 2011 show during Paris Fashion Week, Alexa worn a black dress, while stylist Caroline Sieber was spotted in a modified Valentino fall 2010 couture dress and Valentino fall 2010 shoes.

At the Carlos Miele Spring 2011 fashion show, in New York City, Olivia Palermo worn a beautiful blue graphic cardigan, a summer dress, suede boots, and a CC Skye handbag. Clémence Poésy is a French fashion model and actress that appeared in the successful “Harry Potter” franchise. She was seen at the Chanel Spring 2011 show in Paris looking great in a white blouse and a black skirt.

Chanel Spring 2011 Fashion show managed to bring together so many celebrities, such as Claudia Schiffer, Keira Knightley, Alexa Chung, Rachel Bilson, Clémence Poésy, or Lily Allen. Keira Knightley showed off her new bob haircut, wearing a sweet tweed dress and a black blazer. Rachel Bilson worn a colorful dress adding a rock touch with a leather jacket and high-heeled sandals.

Alexis Bledel looked extremely beautiful at the Monique Lhuillier Spring 2011 runway show in a ruffle one shoulder, knee length dress matched with chunky black shoes and a black satin clutch. Moreover, she debuted her new hair color. Leighton Meester looked great at Derek Lam Spring 2011 runway show in NYC. The “Gossip Girl” star worn a white boatneck cotton pullover, scrunched socks, and black ankle boots.

It is said that the blazer should be a must-have in everyone’s wardrobe. It is versatile and you can wear it with a pair of jeans, but also with sweet, romantic dresses. Whether you are looking for a more casual outfit or a red carpet one, a blazer can become a real lifesaver. It seems that celebrities share this opinion too, as many of them were spotted at different fashion events mixing casual and glamour. For example, Megan Fox matched her blazer with sexy animal printed Louboutin platform shoes for the Emporio Armani show. Also, Jessica Szohr was spotted at the Jill Stuart Spring 2011 show wearing a very trendy outfit with mini skirt, a basic white tee, a blazer, and peep toed sandals.

Sarah Jessica Parker looked glam at the Burberry Prorsum Spring 2011 runway show. The “Sex and the City” star worn a Burberry leather coat with lace-up sandals, and a pink Alexander McQueen purse. Kate Moss attended the Christian Dior Ready to Wear Spring/Summer 2011 show during Paris Fashion Week at Espace Ephemere Tuileries wearing an all-black outfit with a leather pencil skirt, a fur coat, and Mary Jane stilettos.

Photos courtesy of Getty Images, PR Photos