There have been six separate fires in the 31-year-old's neighbourhood with the spreading to 10,000 acres, reported New York Post.
"Britney and her children had to leave her house last week because of the fire scare. They are all safe and staying at the Four Seasons," a source said.
Stars including Spears and teen pop sensation Justin Bieber have mansions close to the area in Calabasas and Thousand Oaks.