By Sophie Kinsella (pen name), author of Shopoholic series. Totally different style, more serious, but wonderful.

Info from book jacket:
At the first of every month, when the office has reached its pinnacle of hysteria, Maggie, Roxane, and Candice meet at London's swankiest bar for an evening of cocktails and gossip. Here, they chat about what's new in the their lives and what's new at the Londoner, the glossy fashion magazine where they all work. But beneath the girl talk and the laughter, each of the three has something to hide: High-achiever Maggie is pregnant, and terrified at the prospect of becoming a mother; glamourous Roxanne is losing hope that her secret lover will leave his wife; and kindhearted Candice cannot escape the guilty secret that has pursued her since childhood.
When a chance encounter at the cocktail bar sets in motion an extraordinary chain of events, their lives quickly spin out of control and their friendship is stretched to the limit. Suddenly, Maggie, Roxanne, and Candice must face their fears and troubles alone, and it is only a matter of time before one of them snaps...

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