Singer, actress, activist, 30
Why it's new: Just like your favorite blue jeans, red can be dressed up or down. But the color makes a crisp, vibrant statement.
How she wears it: Paired with a tuxedo jacket, silk lace top, and heels, red jeans complete what Glassman calls a "French gamine look." "I like clothes that are fabulous and travel well," says Rowland, who goes from promoting her new album, Here I Am, to events for her charity, I Heart My Girlfriends, which encourages camaraderie among young women.
Why You Should Try It: Colored denim (Rowland also owns pink and blue versions) is fun and never schlumpy. "It's amazing what one pop of color can do," she says.
Adam's Tip: Not sure you can pull off fire-engine red? "Go for a subtler bordeaux-like shade, which is easier to dress up for evening." And as with regular jeans, choose a style—whether it's skinny, bootcut, straight-leg, or boyfriend—that suits your body type.
Blazer, Paul&Joe Sister, $350; 310-270-4620. Blouse, Fifteen-Twenty, $253; MadisonLosAngeles.com. Heels, Charles by Charles David, $150; Heels.com. Jeans, Hudson Jeans, $198; Nordstrom.com. Earrings, Roberto Cavalli, $535; 212-755-7722. Cluster rings, David Yurman; 212-724-4255. Faceted cocktail ring, MNG by Mango for JCPenney, $20; 877-346-3527. Metal ring, Forever 21, $4; Forever21.com. Pin, L'Wren Scott, Barneys New York; 877-822-7639. Bracelet, Fantasy Jewelry Box, $38; FantasyJewelryBox.com. Clutch, Salvatore Ferragamo; 800-628-8916.