Britney Spears insists her maid leaves her chores to do around the house - because cleaning is therapy for the pop star.

The Toxic singer admits she gets "mad" if she has no housework because she likes to unwind by getting down on her hands and knees to scrub and clean.

She tells Ok! magazine, "If she takes it all into her own hands, well, what's for me do."

"I'm a cleaning fanatic. Dusting is my favorite, and Windex-ing (cleaning windows)."