Drew Barrymore has transformed her look time and again, but she's forever been Hollywood's flower child. Sometimes literally: She can't resist buying a fresh bunch for her home and always wears her owncosmetic brand—"Flower makeup, of course." Her wardrobe is a bit of rocker chic, a bit of bohemian flair, combined with bold, sexy sophistication, with pieces from Rag & Bone, J. Crew, and Isabel Marant. And she'll never turn down a shopping trip to her favorite High Street store, Topshop. When it comes to beauty, Drew loves a Mason Pearson brush and trusts her Flower Nail Lacquer for stylish and long-lasting nails. ("Because it stays on so long. No, seriously, it really does.") For quick fixes, she's aseasygoing as she looks, armed with "Aquaphor to put on my lips"…