When Britney Spears showed up uninvited at Heidi Klum’s Halloween party late last month, she shocked the model by showing her the correct way to put a diaper on a baby.

Britney, who is currently fighting a bitter custody battle with ex-husband Kevin Federline over their two sons Sean Preston, 2 and Jayden James, 1, stunned those who allege she is a bad mother by giving tips to a speechless Klum.

The wife of Seal and mother of two children said of the exchange; 

"We were talking about babies and diapers and she explained to me a lot of things about diapers I that didn't know.

"You know these sticky things on the side? I never knew that they were there. To close them in the front, I was always putting string around. I had no idea.

"It's very clever. I learned a lot of things."