Blair gives son Arthur a boost in N.Y.C. Plus: Chace Crawford, Justin Bieber, Kristen Stewart and more
Credit: Javier Mateo/StarTraks
Published: Wednesday Oct 24, 2012 | 05:00 PM EDT
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Liv Tyler takes it step by step in N.Y.C. with her favorite student: son Milo, 7, who has it in the backpack on Tuesday.
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