Britney Spears has fled her Calabasas, Calif., home with her kids to escape wildfires that have been threatening the area. A source tells us, “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.” There were six separate fires raging on Friday, the largest spreading to 10,000 acres. Stars including Spears and Justin Bieber have mansions close to the fires near Calabasas and Thousand Oaks. Yesterday, fire crews said they were getting better control of the blaze after wind shifted over the weekend and blew cooler and more humid air in from the Pacific. A rep for Spears didn’t get back to us.