The Sundance Film Festival has been jam-packed with parties, red carpets, and star-studded events since it kicked off witha rip-roaring, blizzard-filled opening weekend. The Bing Bar played host to everyone from Drake on Saturday night to Kristen Bell for her House of Lies happy hour on Sunday. Elsewhere in Park City, Emma Roberts partied with her cast of Celeste and Jesse Forever, while Joshua Read more

Kirsten Dunst and Lizzy Caplan hit the red carpet together to premiere their female-driven comedy Bachelorette at the Sundance Film Festival last night. The girls stuck together for the arrivals interviews and chatted about their own experiences in friends' bridal parties — though apparently there are no crazy bachelorette stories from their real lives. Kirsten's boyfriend, Garrett Hedlund, Read more

Kirsten Dunst, Isla Fisher, and Lizzy Caplan were in matching bridesmaids dresses as they filmed scenes for their new movie Bachelorette in NYC with leading man James Marsden yesterday. James joined the ladies for a day in the park, and the cast looked relaxed between scenes, with Kirsten and Isla even linking arms in their bathrobes and sharing a laugh between takes. Kirsten got straight to work Read more

The cast of Straw Dogs gathered at NYC's Tribeca Grand Hotel last night for their big US premiere. James Marsden and Kate Bosworth shared a moment on the carpet together while their costar and her ex, Alexander Skarsgard, posed solo. She was decked out for the event in an embellished Antonio Berardi dress. Kate and new boyfriend Michael Polish have been inseparable lately, but it doesn't seem as Read more

Alexander Skarsgard and Zac Efron joined stars from Glee and Modern Family last night for Audi and J. Mendel's pre-Golden Globes party in LA. Zac was rolling solo at the bash despite being seen making out with Vanessa Hudgens on Friday, but he was spotted dancing with Brittany Snow and Sophia Bush to Beyoncé's "Single Ladies" at one point. The evening capped off a busy weekend for Hollywood as Read more

After last week's Madonna-themed Glee took off like gangbusters (with rumors of a followup), there have been rumblings about new guest stars coming down the pipeline, too. We already know that Neil Patrick Harris will be paying a visit to the Gleeks, but it sounds like Jennifer Lopez is closer to striking a deal, as well. But the latest name to throw her hat in the ring is Britney Spears. The Read more

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Film sets were buzzing this week with stars busy at work. In Philadelphia, Colin Farrell shot scenes for his film Dead Man Down, while Jude Law got started on A Bitter Pill with costar Rooney Mara in NYC. Also in Manhattan, James Marsden and Tina Fey shared a kiss on the set of 30 Rock. Click through to see what the actors were up to. Read more

The next two weeks of 30 Rock bring a bevy of awesome guest stars for our enjoyment, and we can't wait to see how James Marsden, Denise Richards, and Kelsey Grammer all mesh with the rest of that motley crew. Click through to see all the faces you can look forward to in tonight's and next week's episodes "Idiots Are People Two" and "Idiots Are People Three"! Read more

All over the globe, the stars were keeping busy on TV and film sets. In Austin, Rooney Mara got to work on her film Lawless, while James Marsden kept working on 30 Rock and Daniel Radcliffe was shooting scenes for the beat generation flick Kill Your Darlings in NYC. Across the pond, Sienna Miller was shooting a commercial in London and spotted with her sweet baby bump. Click through to check out Read more