Lively stays in good cheer at the U.S. Open in New York. Plus: Pippa Middleton, Victoria & Harper, Taylor Swift and more
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Updated: Tuesday Sep 06, 2011 | 05:00 PM EDT
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It's all downhill from here! Kourtney Kardashian and son Mason, 20 months, prepare for a swift ride on a slide at an N.Y.C. playground on Friday.
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