Pictures of Leighton Meester, Adam Levine, and AnnaLynne McCord on Set

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From the East Coast to the West Coast (and even Ireland!), the stars kept busy this week with work. Snow covered New York City, which left a few of our favorite Gossip Girl stars out in the cold. But back in Southern California, Adam Levine heated things up while shooting a new music video, and AnnaLynne McCord showed off her blue stomach on the set of 90210. Click through to see all of this week's stars on the set!