The Material Mom has enrolled 4-year-old daughter Lourdes in a martial-arts class, the London Sun says.
The curly-haired youngster is studying a tough, street-wise version of karate called judokai.
"It's the only karate Guy approves of, a non-mincy kind. Not froufrou," Madonna told the newspaper.
She said most martial-arts classes have been "homogenized for people who are not remotely interested in the real discipline."
Lourdes — whose dad is Manhattan fitness-trainer-turned-actor Carlos Leon — was a flower girl at her mom's wedding to Guy Ritchie in Scotland last week.
Madonna can certainly use a karate-kicking little bruiser around the house — her residences in London have been a continual security nightmare.
Earlier this month, a robber broke into her rented mansion, stealing a car from the garage and other items as the pop goddess and her family slept upstairs.
The intruder used a set of car keys from the house to drive off in a Range Rover belonging to Madonna's new hubby.
Madonna has since shelled out $11 million on a posh, six-bedroom townhouse in the trendy Notting Hill community of West London.
She bought the house only after her security team said it could be made safe from thieves and stalkers.
Last year, she bought a townhouse in London's Chelsea area, but sold it a few months later when her bodyguards said it wasn't secure enough.
Her new home is said to be fitted with a state-of-the-art security system that will be able to detect all unauthorized visitors.
The queen of pop — now honeymooning at rocker Sting's English country estate with Guy, their 3-month-old son, Rocco, and Lourdes — is expected to return to London after New Year's.