UPDATE: 11:58 p.m. ET — Britney Spears has responded via her Instagram Story: “It saddens me to hear that my ex husband has decided to discuss the relationship between me and my children … as we all know, raising teenage boys is never easy for anyone … it concerns me the fact that the reason is based on my Instagram … it was LONG before Instagram … I gave them every thing … Only one word: HURTFUL … I’ll…