Britney Spears is no longer on Instagram. As we've been following, Kevin Federline's bombshell memoir You Thought You Knew has had a lot of people talking - even Brit Brit herself! The book has no doubt brought up a lot of painful memories for her, considering all throughout October she made posts addressing all the "lies" her ex was telling. The first post came in early October when the Toxic singer revealed she'd "snapped" her knee - in that post she also revealed her sons Jayden James and Sean Preston went back to Maui with their dad: "My boys had to leave and go back to Maui ...