On Doutzen Kroes: Wearing a couture dress on a red carpet no longer demands a coat of clear polish. At last month's Cannes Film Festival, Doutzen Kroes paired her white Versace dress with L'Oreal's Colour Riche Nail Polish ($5) in Safari Chic. For a gold-flecked version try Butter London's Wallis ($14) and for something more vibrant, Avon's Emerald Noir ($6). At a salon that only stocks Essie? Look for Going Incognito ($8).
On Kristen Stewart: Kristen Stewart's not one for matching, but Chanel's celebrity nail artist, Ashlie Johnson, painted the actress' nails with Chanel Le Vernis Nail Colour ($26) in Graphite, a metallic polish that's just slightly darker than Stewart's Guishem dress. Orly's Steel Your Heart ($8) is similar, though less glittery, while Butter London's Diamond Geezer ($14) lightens things up a bit.
On Whitney Port: Whitney Port accessorized her crop top with another one of this summer's mega-trends: blue polish. She chose Essie's Bikini So Teeny ($8), a periwinkle shade with just a hint of glitter. Thakoon for Nars' Kutki ($18) keeps the powdery color without the shimmer while OPI's What's With the Cattitude ($25) has the best nail polish name we've ever heard.
On Liu Wen: Not surprisingly, the Estée Lauder face chose one of the brand's new spring shades for her turn on the Cannes red carpet. Liu Wen's Pure Color Nail Lacquer ($19) is sold out in Caviar, but plenty of brands are offering shades of gray (!) this summer. Dior Vernis ($23) in Gris Montaigne is perfectly sparkle-less and Julep's Nail Vernis ($14) in Meryl is toxin-free.
On Emma Stone: As if Emma Stone's flowery red Lanvin dress wasn't fun enough, Elle, her manicurist, layered two different Revlon colors--Surfs Up ($5) and Blue Mosaic ($5)--for a sort of turquoise shade that offered a surprising contrast. If you have neither the time nor the palette with which to whip up a custom shade, try Lancôme's Aquamarine ($15) or Sally Hansen's Blue Streak ($5).