It’s all work and no play for Britney Spears today as she shoots a new music video for a song off her hit album Circus. The shoot is taking place in a secret location in the Pacific Palisades, just outside Malibu. All of Britney’s dancers were instructed to be at the shoot very early, hours before Britney showed up. “The dancers are all dressed in metallic colors and shiny tights. They look awesome, with sequins all over their outfits,” says a witness at the shoot. The shoot is said to last most of the day and into the night. “When she works, she is into it and gets it done,” an insider tells In Touch. “She looks great and is so fun to work with. She is funny and professional and has tons of energy today,” the insider adds.