Kate Middleton, when performing her official royal duties, is often seen as the epitome of perfection - especially with her kids. Her radiant smile and engaging conversations during her engagements give the impression that she's absolutely delighted to represent the crown.

Whenever Kate undertakes official royal engagements she is almost always all smiles, but a royal expert has claimed that there is hidden heartbreak underneath the Princess' polished appearance

As the Princess of Wales resumes her royal duties, she finds herself in an unfamiliar place: front and center.

It's the first time that Kate has undertaken a public engagement since sharing an update with the public regarding her health; last month, the royals posted a video of the Prince and Princess along with their children, and Kate revealed that she is cancer-free but still has both good and bad days.

Kate and William were interviewed by Tom Bradby after announcing their engagement in 2010 and a body language expert has claimed that Kate looked "nervous."

A Channel 5 documentary has analysed Princess Kate and Prince William's 2010 engagement interview with ITV, with a body language expert suggesting that Kate was feeling 'nervous'