I stalked, er, stealthily followed around a group of beauty-obsessed girls at Sephora to find out what's worth splurging on
What she bought: Yves Saint Laurent Beauty Rouge Volupte Silky Sensual Radiant Lipstick SPF 15, $34
Her Sephora rule: "Shopping is a personal indulgence for me. I usually go alone so that I don't get interrupted. Plus, my birthday is coming up and I'm planning a party so I wanted to prepare my look in advance. And I knew that Sephora gives you a birthday gift, so I got the Fresh Sugar Kisses Mini lip duo [for free]." -- Sarah K.
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