The year may be winding down, but celebrities are still packing plenty of work into their schedules. Justin Timberlake took The 20/20 Experience to Brooklyn, NY, on Sunday night, where Jay Z hopped on stage for a surprise performance of "Holy Grail." Meanwhile, in NYC, Hilary Duff filmed scenes for a new project, and Emma Stone stopped by Late Show With David Letterman . On the opposite coast in LA, Kristen Stewart jump-started her Monday with a coffee run, and Reese Witherspoon squeezed in a morning workout. Keep reading to see how other celebrities are starting out their week.
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