Kate Middleton is "in heat," a royal source told People. She is really out of her element."

This comes as the Duchess of Cambridge is preparing to turn 40 on January 9, after she hosted a special concert of Christmas carols last week and impressed audiences with her composure.

In the program for the concert, the Duchess wrote heartfelt words about togetherness. One attendee told People, "The words she wrote were beautiful, and it's lovely to bring everyone together like this." 'She felt really confident. If that's our future queen, we're doing well."

In addition to her public persona, Middleton seems to be a total boss in her personal life, especially when it comes to her children. She "takes charge of household matters regarding the kids and schedules," a friend told People. She is "deeply involved in every part of the kids' day."

Another source close to the royal family says the duchess is "increasingly impressive as time goes on. She is a focused and professional woman."

The Duke and Duchess of Cambridge have reportedly recently taken on "higher roles" within the royal family, with the Queen working less and Prince Charles stepping up. [Royal family expert Andrew Rowney previously told the Express, "We're in what you could call a soft regency, where the queen is effectively stepping back and not doing as many roles." Royal family expert Andrew Rowney previously told the Express that.

"As a result, William and Kate, who appear to be very popular, are stepping into positions that Charles and Camilla held. I would go so far as to say they are more popular than Charles and Camilla, so they have been given higher roles."