The Prime Minister left his daughter in the pub after a family mix-up.
David Cameron and his wife, Samantha, were having Sunday lunch at the Plough Inn in Cadsden in Buckinghamshire close to the country retreat of Chequers.
But when they got back they realised their daughter was missing.
Eight-year-old Nancy was left behind because the Camerons travelled back to Chequers in separate cars.
Nancy wandered off to the toilet while they were sorting out transport.
Samantha Cameron assumed her eldest daughter was with her father. But David Cameron thought she was with Samantha.
The Prime Minister drove back to the pub to collect Nancy.
She was away from her parents for about 15 minutes.
Communities Secretary Eric Pickles said he was "delighted" Nancy Cameron was reunited with her family after spending fifteen minutes alone in a pub.
Mr Pickles dismissed the 'mix-up' as perfectly innocent, and in no way reflective of the Prime Minister's lack of parenting skills. He stressed "it could have happened to anyone."
A Downing Street statement said: "The Prime Minister 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 incident happened a couple of months ago."
Katie O'Donovan from Mumsnet added: "Whether you're a Prime Minister, teacher or stay at home mum being a parent is really busy and can be really chaotic. We all have stressful times with our kids where we lose them temporarily and it's one of those things that happens to the best of us."