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Sunday shoppers, rejoice: Celebrity stylist Kate Young‘s collaborative collection for mega-retailer Target hits stores and target.com today! Fans of the eclectic line already include stars like Michelle Williams, Maggie Gyllenhaal, and Kate Mara, who all wore her designs to the collection’s prom-inspired New York launch party this week. “I’ve seen a lot of the pieces from the collection and they’re all really, really different,” Mara told InStyle.com at the launch. “I was choosing between this dress and another dress that doesn’t even look like it was by the same designer, but both equally beautiful. I really appreciate that.” The creator herself shared her secret favorite piece from the collection with InStyle: “I’ve had a long relationship with these clothes at this point, and I think probably my favorite is the bodysuit because it’s so versatile,” Young said of the polka dot suit. “I like to wear the bodysuit under a blazer [like Michelle did]. I also like to wear it under a dress like I am now.” So fun! Click here to see a full preview of the line, and head to target.com to shop the collection now.

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If you’re stepping out for St. Patrick’s Day this weekend, then we know you’ll want to wear your green proudly! To make sure your look stays chic no matter where you go to celebrate, we’ve rounded up some of our favorite green looks, as modeled by celebrities—no “Kiss Me” tee required. We love the boldness of Catherine, Duchess of Cambridge‘s kelly green Mulberry frock—and the solid block of color is a slimming trick! But Jessica Alba proved that a splash of green can make a strong statement, too, by grounding her olive pants with a neutral top and accessories. If head-to-toe brights aren’t your thing, take a cue from Selena Gomez, who paired her metallic mini with peach Nicholas Kirkwood pumps, or Kate Mara, who opted for a subtle mint green Peter Som sheath. Each look is unique, so pick the one that best matches your party venue. And may you live large in Pantone’s Color of the Year this weekend!

Plus, see how more celebrities are wearing green this season.

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• Check out Jessica Alba’s New Book, The Honest Life
• Monique Lhuillier’s Emerald Green Fashion Week
• Love Star Style? Get More with Our Newsletter!

Sisters who shop together make for a stylish pair! Proof: Rooney and Kate Mara, who both looked gorgeous at last night’s Side Effects premiere in their monochrome frocks (Rooney’s McQueen was our “Look of the Day” pick) and Nicholas Kirkwood heels. Both Mara ladies chose a style from the pre-spring 2013 collection of British designer’s award-winning brand—he just picked up the grand prize from the British Fashion Council’s Fashion Fund. While Kate chose black suede pumps with a swirling design ($895 at modaoperandi.com), Rooney went for ballet pink patent slingbacks ($895 at Nicholas Kirkwood stores). We hope they share with each other!

Click through to see more celebrity heels we love.

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