David Cameron went home from an afternoon at the pub unaware he had left his eight-year-old daughter Nancy behind.
David and Samantha Cameron are said to have enjoyed Sunday lunch at the Plough Inn in Cadsden, Buckinghamshire when Nancy left the group to visit the lavatory.
As David and Samantha organised which child should travel home in which car, Nancy allegedly got left behind, as each of her parents assumed she was with the other.
The Sun reports that Mr Cameron and his wife were 'distraught' when they discovered what had happened. A spokesman for No. 10 told the paper:
"The PM and Samantha were distraught when they realised Nancy wasn't with them.
"Thankfully when they phoned the pub, she was there safe and well.
"The PM went down straight away to get her."
David and Samantha had taken Nancy and her brother Arthur, six, and baby sister Florence, 22 months, for the lunchtime treat with two other families. The confusion is said to have occurred when Mr Cameron left in his car surrounded by bodyguards as his wife followed in a car behind.
Mr Cameron reportedly found his daughter 'helping' staff in the pub when he drove the two miles back to collect her 15 minutes later.
A Downing Street spokesperson said: !As you know, the prime minister is a very busy man but he always tries to live as normal a life as possible with his family."
The Sun quoted a Plough insider as telling the paper: "You'd have thought someone would have done a headcount or something.
"Pub staff found their daughter in the toilet and didn't know what to do.
"It's not like you can look up David Cameron in the phone book and then ring to say, 'You've left your daughter behind'.
"It's frightening the prime minister of Britain can forget something so important as his own daughter."
Well done, Dave. Have you ever done something like this? (Bet you have!)