Oooh, I'm excited to see some new-to-me authors here - can't wait to check them out!

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I second the suggestions for Jennifer Weiner, Katie Fforde, Helen Fielding,and Jane Green. Amaranth, I love British chick lit, too!
I don't care for the Shopaholic books at all - to me, they're just incredibly stressful to read and not funny at all. But I do like her other books, like
The Undomestic Goddess and
Can You Keep A Secret?