A Kensington Palace official fired off a stern letter to media outlets on Friday (14Aug15), urging them not to purchase paparazzi pictures of the toddler amid concerns snappers are using "increasingly dangerous" tactics to obtain the photos, posing serious security risks.

In the notice, Communications Secretary Jason Knauf outlined a series of recent incidents which have warranted cause for concern, including the use of long range lenses to snoop on the Duchess and her son playing in a private park, hiding on private property, and pursuing cars leaving the family's homes.

Knauf goes on to applaud those publication bosses who have obliged the royals' wish to only print authorised pictures or images taken at official photo opportunities of their kids, and warns that any photographers who breach the young family's privacy will face legal action.

He adds, "We have made the decision to discuss these issues now, as the incidents are becoming more frequent and the tactics more alarming. A line has been crossed, and any further escalation in tactics would represent a very real security risk."

Prince William and Catherine, Duchess of Cambridge's plea for privacy emerges three months after they welcomed their second child, Princess Charlotte, in May (15). The couple introduced the baby girl, who is fourth in line to the throne, to the media hours after her birth by posing on the front steps of the Lindo Wing at St. Mary's Hospital in Paddington, London.