[1.8] Get who/what the player is spectating client sided.

In EntityPlayerMP There's a method .getSpectatingEntity() to get the entity the player is spectating, my problem is that I need to get that on the client side (From minecraftInstance.thePlayer) which is EntityPlayerSP, I can't find a method for it anywhere and when trying to cast EntityPlayerSP to EntityPlayerMP you can't, I can however cast EntityPlayerSP to EntityPlayer, then EntityPlayer to EntityPlayerMP, however for some reason in-game (Doesn't show it in eclipse) It thinks I'm casting EntityPlayerSP to EntityPlayerMP and crashes. So anyone know how to get what the player is spectating from the client side?