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Although "Sex and The City" star Sarah Jessica Parker appears confident in her hit series and movies, the actress admits to having ongoing on-set jitters.

"I lose my appetite," Parker told Vogue in an interview for their August issue of her on-set jitters.

Parker revealed that her nerves had gotten the best of her "by Wednesday of the first week" of filming the upcoming comedy "I Don't Know How She Does It."

"I was sobbing, I was apologizing," she told the magazine. "I was feeling so awful and ashamed, like I had let the director down. If only they would not tell me when the camera was running, I would be OK.

"I'm like that two weeks into every movie," she added.

In the film, due out on September 16, Parker plays a financial executive supporting her husband (played by Greg Kinnear) and two children - a role she can relate to as a working mother of three, says Access Hollywood.

Parker, who had her first child, James Wilkie, with husband Matthew Broderick in 2002 and twins in 2009 when she was 44, says she worries about being an older parent.

"I've had a lot of opportunities to do the things that I wanted to do, like sleep. I have slept till 11 [AM] for a lot of years," she told the mag. "The only thing that I'm concerned about is the energy: I hope I can maintain the energy. I think about all the years I've spent parenting James Wilkie and everything I put into it, and there are two of them."