Celebrities finished off the first month of 2013 with a week full of work. In LA, Justin Timberlake and Jay-Z fooled around on the set of their new music video for "Suit & Tie," while Zac Efron filmed scenes for Are We Officially Dating? with two of his costars in NYC. David Beckham took a break from shooting goals to shoot an Adidas commercial in Spain, and in a much colder climate, Claire Danes brought baby Cyrus to visit Hugh Dancy on the set of his new show Hannibal in Toronto. Click through to see all the stars on set this week!

Many of TV and film's biggest stars may be gearing up for this weekend's SAG Awards, but they've also been working away on set. In LA, New Girl star Zooey Deschanel showed off her athletic skills, while Cory Monteith was dressed to impress on the set of Glee. Onscreen love was in the air in NYC as Zac Efron strolled hand in hand with Imogen Poots while filming Are We Officially Dating?, and AnnaSophia Robb and Austin Butler kissed for The Carrie Diaries. Click through to see all the stars on set this week.

A busy award season hasn't slowed down the Hollywood stars who spent this week hard at work on set. In NYC, Jennifer Connelly spent a day working on Winter's Tale with her daughter, Agnes Lark Bettany, by her side, while Colin Farrell took center stage on the same set later in the week. In LA, Elizabeth Banks brightened up the set of Walk of Shame in an all-yellow ensemble, and things got intensely funny on the set of New Girl in a scene with Zooey Deschanel, Max Greenfield, and Jake Johnson. Click through to see all the stars on set this week!

Stars got busy before the holiday break on sets across the country. Tina Fey wrapped work on the final episode of 30 Rock, while Zac Efron reported to the NYC set of Are We Officially Dating?. A pregnant Busy Philipps wore a colorful look for the cameras for a Cougar Town scene in LA, but there were plenty more celebrities on set. Click through to see them all!

The holidays are fast approaching, but Hollywood stars are still hard at work. Colin Farrell rode around NYC on a horse for Winter's Tale, which he and Russell Crowe have been shooting all week. In Pittsburgh, Channing Tatum flexed his muscles while Mark Ruffalo showed leg in a wrestling leotard on the set of Foxcatcher. Matthew McConaughey suited up in a pilot's uniform to shoot scenes for The Dallas Buyers Club in New Orleans, and in LA, a pregnant Malin Akerman grabbed a sweet snack during a break from Trophy Wife. Click through to see more of this week's stars on set.

The holiday season has officially begun, but it hasn't slowed down some hardworking Hollywood stars. In LA, Hilary Swank looked sweet and stylish on the set of You're Not You, while Courteney Cox took a romantic stroll on a Malibu beach with her Cougar Town costar Josh Hopkins. Zooey Deschanel and Jake Johnson also appeared to be getting close during a scene for New Girl, and across the country in Philadelphia, Liam Hemsworth arrived for a day of work on Paranoia. Click through to see the rest of this week's stars on set!

The weather may be turning cold, but some of Hollywood's heavy hitters are heating things up on set. Brad Pitt trekked to the south coast of England to film scenes for World War Z, while Tom Cruise suited up for All You Need Is Kill in London. Leonardo DiCaprio hopped aboard a helicopter to shoot The Wolf of Wall Street in NYC, and Jennifer Lawrence joined her Hunger Games costars in Hawaii to shoot Catching Fire. Click through to see all this week's stars on set.

Hollywood stars didn't let a short workweek slow them down as they kept busy on sets all over the country. Jennifer Garner had Seraphina and baby Samuel with her in New Orleans as she filmed The Dallas Buyers Club, while Channing Tatum trekked to Pittsburgh for his latest role in Foxcatcher. Lea Michele and Chris Colfer bundled up in NYC for Glee, and Taylor Swift got swept off her feet while shooting her latest music video in LA. Click through to see more stars on set this week!

Hollywood legends and heartthrobs had a busy workweek. In London, Brad Pitt got a little bloody for World War Z reshoots, while Chris Hemsworth suited up for his hammer-wielding role in Thor 2. Nicole Kidman looked like royalty in Monaco for Grace of Monaco, and in NYC, Leonardo DiCaprio showed off his athletic skills on the set of The Wolf of Wall Street. Click through to see all the stars in action this week!