Some celebs just know how to work a red carpet. When you want to know what’s hot, look to these five always-sophisticated stars.Carrie UnderwoodAmerican Idol has produced chart-toppers, platinum-album–sellers, Grammy winners, a Tony nominee, and an Oscar winner, but it’s only given us one genuine glamazon. And we’re not talking about Jennifer Hudson. (Or Adam Lambert.) Season 4 winner Carrie Underwood brought out yet another jaw-dropping dress at the recent Academy of Country Music Awards in Las Vegas—a Jean Fares Couture gown in oh-so-trendy royal purple, topped off by Sutra sapphire and diamond earrings. No wonder they call her the reigning queen of country.Pink tourmaline and rose-cut diamond earrings (same design as Carrie’s); $5,400; Sutra Jewels, Houston, 713-988-8210, sutrajewels.comUnder $500Purple Lace Collection earrings with iolite quartz and Swarovski crystal; $33