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Paris Hilton signed autographs at "The Late Show with David Letterman" at the Ed Sullivan Theater in New York City.

Nathan Fillion signed autographs at "The Late Show with David Letterman" at the Ed Sullivan Theater in New York City.

Gwen Stefani proved it is possible to mix a music career with fashion design, as she took her Autumn 2011 L.A.M.B. collection to New York.

Saturday's Celebrity GPS is here, kittens! Today's rainy day brings us a grooving Zac Efron and his hot friend, also Puffy Diddy, Chris Brown and more! "Glamour Zombie" music by Brandon Hilton.

Celebrity GPS hits New York for more Fashion Week coverage, seeing the likes of Angelica Huston, Michael Douglas, Debra Messing and more!

It's a rainy season for Hollywood ... but we still got some stars! This episode features Paris Hilton in New York outside the David Letterman Show, Ted Williams at Millions of Milkshakes West Hollywood, Carmen Diaz and A-Rod at Matsuhisa Restaurant, American...

Grey's Anatomy star Ellen Pompeo attends the Gucci - Pre Grammy Brunch and said she was excited to see Rihanna perform at the 53d Annual Grammy Awards.