Selena Gomez

Larry Busacca/Getty Images

It may have been cold at the Sundance Film Festival yesterday, but Selena Gomez was in town helping heat things up.

The actress-singer jetted into Park City, Utah for her first trip to the fest to promote Rudderless, her new indie drama costarring Billy Crudup and William H. Macy (the movie also marks the Shameless star's directorial debut.)

Gomez was followed by a crowd of dozens of young people for most the day as she made her way around the city.

She and her costars held court at a late night party on Main Street. Gomez looked winter chic in a long cream sweater with black pants and boots. Her hair was down and she wore two simple gold necklaces.

Billy Crudup, Selena Gomez, William H. Macy

Jeff Vespa/WireImage

And the best part? Not only did Gomez wow the crowd with a performance of a beautifully moving track from the movie, but she also surprised guests by belting out "Come and Get It" at the end of the night.

When she wasn't singing, she was dancing and snapping photos with the cast and crew.

We're happy to see how awesome Gomez is doing. She announced last month that was canceling the Australian leg of her concert tour to "spend time on myself in order to be the best person I can be."

For more Selena in Sundance, check out my exclusive sit-down interview with the megastar later at E! Online and on E! News tonight at 7 p.m. And 11:30 p.m.

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