Speculation of photo doctoring comes after Kate Middleton seemingly manipulated a recent Mother's Day portrait.
A source tells ET that the Princess of Wales wanted apologize in order to acknowledge any misunderstanding.
Kingston's funeral service was attended by William and other close family and friends.
ET spoke with Katie Nicholl in the wake of the Princess of Wales' recent photo editing kerfuffle.
Royal expert Katie Nicholl tells ET the royal family appears 'vulnerable' amid health battles and ongoing public speculation.
Kate Middleton admits to editing the portrait she shared with her three children in honor of Mother's Day in the United Kingdom.
The couple was photographed in their car together on the way to an appointment.
Several news outlets pulled the image released by Kensington Palace on Sunday, claiming it appeared to be 'manipulated.'
Some photo agencies are claiming the image in the Princess of Wales' Mother's Day post has been altered.
Sunday, March 10, is Mother's Day in the U.K. The royal family also honors Kate Middleton.
The Princess of Wales underwent abdominal surgery in January and has been the subject of lots of online speculation.
Kate Middleton's absence has left royal watchers with questions following the announcement of her abdominal surgery.
Kate Middelton emerges for the first time in 70 days following her recent hospitalization.
The 42-year-old Princess of Wales was seen riding in a SUV driven by her mother.
