Lena Dunham, Emmy Rossum, Chanel Iman, and More Celeb Sightings This Week in NYC

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CHELSEA—On Thursday, Olivia Wilde, Rose Byrne, and Emmy Rossum were on hand as the Marimekko for Target installations were unveiled on The High Line. [Neilson Barnard/WireImage.com]

FLATIRON—Chanel Iman and Camilla Belle helped celebrate the opening of the Tory Sport flagship on Wednesday. [People]

NEW YORK CITY—Cameron Diaz is having book signings at Barnes & Noble locations all over the city for The Longevity Book, her latest title that follows The Body Book. [Just Jared]

MIDTOWN—Lena Dunham paid a visit to Rockefeller Center on Wednesday, where she promoted Girls on Late Night with Seth Meyers. [NBC/Getty Images]

MIDTOWN—Ashley Greene was photographed on her way to Good Morning America earlier this week. [People]

SOHO—Gigi Hadid was spotted out and about wearing an off white wool Mackage coat. [Robert Kamau/Getty Images]

Got a celebrity sighting of your own to share? Let us know about it in the comments section.