Have you ever hit the mall with a hankering to buy something, but not the slightest idea as to what that may be? In these plan-free times, we tend to make impulse purchases: maybe it's a pair of shoes we really didn't need or a top we grabbed without trying it on. While the conspicuous consumption is momentarily satisfying, unfortunately these shopping sprees often result in that dreaded feeling of buyer's remorse! To avoid this problem, dear readers, we suggest deciding ahead of time exactly what you want to buy--and who better to inspire your shopping list than today's quintet of stylish celebrities? Next time you're ready to make some summer wardrobe investments, consider Kirsten Dunst's lovely daytime ensemble or one of Ashley Olsen's recent looks, and we promise you'll make smart buys in a snap!

1. Katie Holmes
Katie Holmes piqued your interest late last month when she demonstrated she knows how to execute a smart and stylish beach ensemble. Photographed in Miami, Holmes wore Ever's Roatan Pullover ($128) with Balenciaga wedges and Express' Straw Fedora ($37). An open-knit sweater can function as an excellent cover-up piece, so you definitely don't want to miss out on Twist & Tango's Self Stripe Knit Dress ($151) and Free People's In Between The Lines Cap Sleeve Open Knit Sweater ($39) for all your poolside activities. Of course we weren't surprised to see that your favorite part of today's featured look was her Hermes Steeple Shopping Bag ($2922, 800.441.4488)! If you're yacht-bound this summer or just simply looking to create a similarly savvy neutral mix, we also recommend picking up Phillip Simon's Aviya Espadrilles ($77), Madewell's City Walk Fedora ($48), and Milly's Sailboat Canvas Large Tote ($131) today.

2. Karolina Kurkova
While we're still coveting white flare jeans, we're also fans of a slim version a la Karolina Kurkova. The blonde bombshell was spotted out in New York last week wearing Rag & Bone's Mid-Rise Skinny Jeans ($165) in Bright White with a plaid Madewell button-down shirt, which is no longer available, and a pair of flats she picked up from a boutique in Cannes, France. As for the accessories, Kurkova selected Chanel sunglasses and a leopard-print Azzedine Alaia clutch. To construct an equally memorable outfit, snag a plaid shirt--Forever 21's Plaid Boyfriend Shirt ($20), Rails' Kendra Gauze Shirt ($97), and American Eagle's Plaid Shirt ($30) are all must-try options--and team it with either River Island's White Lust Skinny Jeans ($69) or Express' Zelda Jeans Leggings ($49). If it's Kurkova's bag you fancy, Stuart Weitzman's Darly Convertible Clutch ($254) and Tilly's Bow Front Wallet ($12) both make for worthy alternatives.

3. Kirsten Dunst
Whether she's wowing crowds in a menswear-inspired suit or looking fabulous in a floor-length gown, Kirsten Dunst's sure been wooing you with her impeccable sense of style. Recently, it's her totally cute afternoon attire that's making your sartorial hearts skip a beat. The actress stepped out in Soho early last month wearing a periwinkle Louis Vuitton Silk Dress (price available upon request, 866.VUITTON) and SC Wedge Sandals (price available upon request, 866.VUITTON), both from the fashion house's Cruise 12 collection. To keep her easy-breezy ensemble simple and fuss-free, Dunst opted for minimal accessories, which included a Sophia Coppola for Louis Vuitton Bag ($3950, 866.VUITTON) and her go-to Ray-Ban Clubmaster Sunglasses ($145). An ideal combo for the warmer months ahead, we recommend picking up Nasty Gal's Polka Dot Shirt Dress ($48) or Patterson J. Kincaid's Imperial Cinched Waist Dress ($158), and pairing either one with Lilly Pulitzer's Resort Chic Wedges ($198) or Butter's Showw Peep Toe Wedges ($148). Finally, be sure to snag Kenneth Cole New York's No Slouch Leather Satchel ($199) to further achieve Dunst's winning ensemble.

4. Liv Tyler
If we had to determine your latest sartorial crush based on celebrity-outfit inquires alone, the absolute frontrunner would be Liv Tyler--and we'd have to agree! After all, the actress has been stepping out in some pretty fantastic ensembles lately. Just take, for example, the lovely summer-in-the-city outfit she put together while out and about in New York late last month. Tyler caught your attention when she wore a lip-print DKNY Stretch Silk Dress with Wrap Belt ($325) with red Christian Louboutin Devalavi Chunky-Heel Slingback Heels ($845, available here in black and nude). It's a simple-yet-sweet combo that happens to be perfect for a number of warm-weather occasions, so don't hesitate to check out her exact picks or J. Crew's Souvenir Dress ($148), Lauren by Ralph Lauren's Faux Wrap Matte Jersey Dress ($134), and Guess' Hondo Pumps ($47) before the season fizzles out. To complete her look, Tyler selected Givenchy's Nightingale Bag ($2630), but if you're looking to stick to a budget we're also quite fond of Urban Expressions' Zarina Convertible Satchel ($60), which boasts a similar shape and comes with a more affordable price tag.

5. Ashley Olsen
Between the launch of their exclusive t-shirt site StyleMint and a bevy of seriously stylish outings, we can safely say all eyes are on the Olsens these days. Speaking of the latter, you spotted Ashley out and about in New York last week sporting a truly enviable casual-chic mix. While you adore the simplicity of her gray shirt from The Row, it was her turquoise Junya Watanabe skirt, Chanel sandals, and The Row bag that really won you over. To create an Olsen-inspired ensemble of your own, start with the essentials, like LA Made's Basic V Pocket Tee ($35) and Truly Madly Deeply's Printed Below-The-Knee Pencil Skirt ($39). Next, scoop up a pair of sandals, like French Connection's Phoenix Chain Detail Thon Flat Sandals ($69) or Isola Shoes' Adena Flat Sandals ($135), and finally, pick up Calvin Klein's Highline Pebbles Leather East West Tote ($228) to give your look a polished finish.--Jessica Baker, with Erin Fitzpatrick

Photos of Katie Holmes, Karolina Kurkova, Liv Tyler, and Ashley Olsen, courtesy of INF; Photo of Kirsten Dunst, courtesy of Bauer Griffin