Kate Middleton is looking healthier than ever just six weeks after giving birth to her second child and it's all thanks to an excellent instructor.

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On Wednesday, People posted the details on how the Duchess of Cambridge kept her body so fit during and after her pregnancy. She reportedly had a London trainer who helped her stay in shape. According to the site, this exercise trainer "was brought on board while she was pregnant and is super-discreet."

Apparently, it was a pretty expensive deal, but the results were worth it.

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"The trainer checks in remotely with Kate by phone every day as well as seeing her in person one a week," a source said.

Considering that Middleton knows a proper diet, her instructor reportedly suggested tasty yet healthy selections.

"The food is very elegant and actually feels like food you would eat at a restaurant," the source said.

Meanwhile, a report from OK! Magazine claimed that Middleton was planning to take a trip to New York with her husband, Prince William, and their two children, George and Charlotte. According to the site, this was partially inspired by William's late mother, Princess Diana, who gave words of wisdom to her children.

"Diana used to sit down with William and show him photographs of her travels, and she'd point out the exotic places she went on maps," an insider said. "She'd tell him that he should never settle for a life inside the palace walls, and that he must experience all that the world has to offer."

Tags: Kate Middleton Prince William