Kevin Federline may be putting Britney Spears on blast in print, but he hasn't actually spoken to his ex-wife in a VERY long time! Defending his new tell-all, You Thought You Knew, while speaking to DailyMail.com on Tuesday, K-Fed revealed he hasn't had any communication with the pop star "for a long time." But how long are we talking? It's kinda shocking considering they share two kids! He dished: "It's definitely been some years." Whoa. Years?? That's kinda sad.