"I was impressed with her focus," says Wayne Isham, who worked on "Piece of Me"

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After last week’s preview of Britney Spears‘s new video, “Piece of Me,” its director, Wayne Isham, is now offering some insight into what it was like to work with her on it.

Spears gets nothing but high marks, according to the producer, whose credits include videos for Madonna, Metallica, Faith Hill and ‘N Sync.

“On set,” says Isham of Spears, “she was very professional, excited to work and beautiful as always. I was impressed with her focus as she choreographed the dance herself. Her endurance was remarkable, as we had a long day.”

He adds, “She almost outlasted me, which is amazing! It was a pleasure to work with her again.” (He also directed the “I’m Not a Girl, Not Yet a Woman” video for Spears.)

The video is intended as a broadside against the paparazzi. It features the pop star, 26, in a black bra and ripped jeans, alternating a short cropped fur vest with a longer white fur coat, and singing about the photographers who hound her day and night.

As Spears writhes in front of a multicolored display, photographers are seen jostling below a lighted window, snapping pics of a band of Britney look-alikes who are dressing for a night out.