Article continues below advertisementBritney Spears is clapping back at Kevin Federline's recent claims about her.In a Tuesday, October 21, Instagram post, the pop star, 43, alluded to her ex's remarks about her concerning past behavior.Article continues below advertisementSource: MEGAKevin Federline was married to Britney Spears for two years."Triple dog dare you to PLAY ... in a world where I've always felt too scrutinized and judged ... remember the ones you love the most will hurt you the most," she captioned a black-and-white photo of two unidentifiable people playing chess.