Summer vacations are looming on the horizon, so we expect you might be doing some last minute shopping for the season's essential pieces. It doesnÂ't matter why you're scrambling nowÂ--maybe you had a huge project at work, or perhaps you were stuck studying for finals in the 24-hour library roomÂ--just know that you'll find many of your sartorial solutions right here! That's right, we've been pouring over your inquiries and, after hours of research and preparation, are pleased to present today's A+ fashion report, complete with your favorite celeb-inspired summer looks. Just make sure you take good notes, because in today's What Was She Wearing: Answers! we reveal a bevy of insider information that will take you straight to the top of your class in style.

Sienna Miller
We received loads of inquiries about the ravishing Sienna Miller and her off-duty ensembles, which is no surprise to us! Her undeniable fashion sense continues to win over your hearts and today's shimmering outfit selection certainly made you swoon. It was Miller's stunning frockÂ--a Matthew Williamson F/W 2010 Foiled Chiffon Twist Dress ($2,020) to be exactÂ-- and Camilla Skovgaard A/W 2009 Sandal Bootie Wedges that she wore to the launch party of the collaboration between Matthew Williamson and Belvedere Vodka late last month that caught your eye. Seeing as the said dress won't hit stores until late this summer, we suggest you check out Iro's Ivli Dress ($386) and Jeffrey Campbell's Dipper Black Leather Open Toes Booties ($135) to get your hands on an equally desirable combo right now. Miller used a vintage belt to give her frock a little more shape and added a splash of color to the entire look with Prada's Saffiano and Tessuto Tote ($1,550) from the F/W 2009 collection. To ensure you accessorize in a Miller-worthy fashion, pick up a Lands' End Canvas Heritage Leather Belt ($40) in bridle brown and Cole Haan's Genevieve Small Carpet Bag ($235), and be sure to finish off your look with a bright red lip!

Stella McCartney
Stella McCartney's S/S 2010 show was a beautiful display of chic summer essentials, which is why it is no surprise that the designer would dress head-to-toe in her own creations while out making a school run in London last month. Starting from the top, McCartney sported Rounded Aviator Sunglasses ($225) with the Silk Slub Dar Jacket ($1,139) over a White Jersey T-shirt ($295) shirt and Grey Coolfit Denim Jeans ($425). She rounded out her outfit with Linda Wedge Sandals ($299) and the Falabella Large Tote Bag ($1,095)Â--all from her eponymous line, of course. You enjoyed the outfit as a whole, but we think any of these pieces would be a sound investment on their own. If you can't splurge on one of these amazing McCartney items, then you should check out Urban Outfitters' Colorblock Metal Aviators ($16), Rebecca Minkoff's Python Passion Nikki Hobo ($395), +J's One Button Neck Tab Blazer ($43), and Michael Kors' Francesca Suede Wedge Sandals ($225). These pieces will help you achieve the designer's look, affordably.

Rachel Bilson
We were excited to see the assembly of fashionable femmes at this year's Cannes Film FestivalÂ--check out our top picks in May's What They Wore: Cannes storyÂ--and it appears one of your favorite looks came via Rachel Bilson at the Blue Valentine after party. Bilson celebrated the highly acclaimed film, which stars Michelle Williams and Ryan Gosling, in a sheer leopard print dress from Isabel Marant's F/W 09 collection, perfectly accessorized with a 3.1 Phillip Lim Double Wrap Around Belt ($225), Yves Saint Laurent's sold-out- t-strap heels, and a vintage shoulder bag. To create your own interpretation of Bilson's feline look, try Satine's Cheetah Print Dress ($295) for a similar print and silhouette, and be sure to cinch the waist with Eileen Fisher's Earth Conscious Double Wrap Leather Belt ($58) to give yourself a more feminine shape. Finish off your outfit with Antik Batik's Clami Pouch ($208) and Elizabeth and James' Paris T-Strap Pumps ($295) for a Bilson-approved ensemble.

Kirsten Dunst
After what felt like a long hiatus from both the film and fashion worlds, you were excited to see Kirsten Dunst in attendance at the 63rd Annual Cannes Film Festival looking quite sweet as she took an afternoon stroll along the Croisette. It was Dunst's Miu Miu Printed Silk Cady Skirt ($1,000)Â--pick up Pins and Needles' Zip Front Full Skirt ($25) for a superb look-a-alike optionÂ--that stole the show, but she showed off her love for Chanel with a Cream Blouse ($1,730) from the F/W 2010 collections, Denim Sunglasses ($290), and Classic Flap Bag ($3,475) in tweed and silk, all from the famed fashion house. We recommend Topshop's Weave Cross Body Bag ($60), Ann Taylor's Dahlia Appliqué Top ($60), and ASOS' Tortoise Retro Sunglasses ($17) to reiterate her girlish accents on a wallet-friendly budget. Lastly, grab a pair of Charlotte Russe Huarache Flats ($19) to finish the overall look. Â--Jessica Baker

Photos of Sienna Miller and Rachel Bilson, courtesy of Getty; Photos of Stella McCartney and Kirsten Dunst, courtesy of Bauer Griffin
EXPLORE: What Was She Wearing, Kirsten Dunst, Rachel Bilson, Sienna Miller, Chanel, Matthew Williamson, Miu Miu, Stella McCartney


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