With a surprise snowstorm pummeling the Northeast over the weekend came the (unofficial) transition to a new style season. Leather pants, cute collars and button-down blouses are all on display in our gallery of the hottest trends for the colder weather. Click through to the gallery to  style stars like Alexa Chung, Jaime King, Rachel Bilson and others are rewriting the style rules for fall and winter fashions. [Start the slide show]

Doesn't it seem like Katy Perry has been around forever? Alas, her breakout album, One of the Boys, was only released three years ago. Still, the former Katy Hudson (she changed her surname so as not to be confused with then-bigger star Kate Hudson) was on the fringes of the music industry all the way back in 2001, when she dropped out of high school and released her first (gospel rock!) album (she later earned her GED). Now an uncontested star, the singer's signature style has made nearly as many headlines as her award-winning music. As Perry turns 27, we take a look back at her style evolution, from fresh-faced high schooler to sexy, pinup-worthy siren. [Start the slide show]

Mia Farrow, Jean Seberg, Twiggy -- the cropped 'do has a long celebrity history, but today's pixie is much more versatile. Michelle Williams and Emma Watson remain fans of that classic cut, while stars like Ginnifer Goodwin and Ashlee Simpson prefer an edgier short look. Evan Rachel Wood often styles her hair with a nod to '80s new wave, and Carey Mulligan and Vanessa Hudgens keep their crops shaggier with side-swept bangs. Thinking of making the cut? Browse through our gallery of the cutest short cuts for inspiration. [Start the slide show]

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She plays a French Vogue editor in next month's The Muppets Movie, but in the pages of November's InStyle magazine, Miss Piggy is all centerfold, modeling custom designs by the likes of Jason Wu and Prabal Gurung in an eight-page spread. For their part, the designers were more than game, explaining to WWD the inspirations behind their creations. "I didn't want to dress Miss Piggy in anything that would take away from her bold personality so I went with a simple, classic dress and neutral color," said Gurung of his white duchesse-silk dress, adding, "the Empire waist really complements her figure."

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