As stars celebrated the Golden Globes, Zac Efron was gearing up for a picture-perfect day at work. On Monday, the actor kicked off his week on the set of his upcoming movie Dirty Grandpa, which also stars Robert De Niro. In other can't-miss moments, Kristen Stewart touched down in NYC, Sofia Vergara didn't let bad weather damper her mood, and the Mad Men cast made a photogenic appearance. Keep reading to see all that and more.
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