Stars got back to work on movie and TV sets this week after the holiday break. Zac Efron filmed several romantic scenes with costar Imogen Poots for Are We Officially Dating? in NYC, while his The Paperboy costar Nicole Kidman got to work on Grace of Monaco in Paris. Katharine McPhee was busy filming a new episode of Smash in New York, but that's not all that happened in front of the cameras. Click through to see those stars and many more on set this week!