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Spotted: Penn Badgley and Blake Lively taking a stroll through Central Park in head-to-toe blue denim. The Gossip Girl step-siblings had different takes on the popular trend:  Dan paired a classic chambray button down with dark ink-blue jeans, while Serena dressed down her sparkly minidress with a Nanette Lepore denim blazer and flip flops.  And it’s not often that we see Ms. van der Woodsen in such casual footwear—only Serena could make them work while sporting sequins and a Chanel bag!

—Christina Rutherford