Kevin Federline was not a #FreeBritney supporter. In his upcoming memoir, You Thought You Knew, Federline, 47, writes that the fan-led movement to end his ex-wife Britney Spears' 13-year conservatorship may have "started from a good place," but he believes it ultimately did more harm than good. "All those people who put so much effort into that should now put the same energy into the Save Britney movement," he writes in an excerpt published by The New York Times on Tuesday, October 14. "Because this is no longer about freedom. It's about survival.