Hollywood's Hottest Moms

With pregnancy rumors in the air, Ashlee Simpson hit an N.Y.C. party in a 3.1 Phillip Lim dress with an open back. Simpson told MTV, "When people deny [pregnancy reports]] it's probably because it's something they want to keep personal." Days later, Simpson released her second album, Bittersweet World and a clothing collection for Wet Seal.

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Linen-blend dress, 3.1 Phillip Lim, $506; at net-a-porter.com.