Washington (ANI): Pop star Britney spears has been claimed to be a thorough professional on the sets by Wayne Isham, the director of her new video Piece of Me. After the preview of the video, Isham revealed the experience of working with the Toxic star and she got nothing less than perfect marks for her behaviour on the sets.

"On set, 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," People quoted Isham, as saying. He added: "She almost outlasted me, which is amazing! It was a pleasure to work with her again."

Isham"s credits include videos for Madonna, Metallica, Faith Hill and 'N Sync. He also directed the "I'm Not a Girl, Not Yet a Woman" video for Spears. This video is intended as an attack against the paparazzi and features the 26-year-old singer 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 chase her day and night.

In the video Spears twists in front of a multicolored display while photographers are shown to jostle below a lighted window, snapping pics of a group of Britney look-alikes who are dressing for a night out.