Britney Spears has hit back at her ex Kevin Federline after he scrutinized her for presenting bare via virtual entertainment. The 40-year-old and 44-year-old backing artists were hitched from 2004 until 2007, and together they share two children; 16-year-old Sean Preston and 15-year-old Jayden James. In a dangerous meeting that was prodded on Saturday, Kevin shared his perspectives on Britney – asserting he thinks her disputable conservatorship “saved her life” and saying that their children battle with the reality she presents stripped on Instagram. In any case, taking to Instagram…