A Thames Valley Police officer recorded himself sexually assaulting a young girl on her mobile phone while off duty, a court heard.
Former Pc Luke Christopher Horner travelled to Rushden, Northamptonshire to attack the 13-year-old on June 11.
In a hearing at Northampton Crown Court on Thursday, the 24-year-old, who was based in Amersham, Buckinghamshire, pleaded guilty to a charge of sexual activity with a child. Horner resigned as an officer on July 26, TVP confirmed following his plea.