My friend and I have been debating about this for the last five minutes. I have mixed feelings about this pairing, but my friend thinks that this should definitley happen.
I think that Klaus is using Caroline for information or something like that.
She said that she's only seen Klaus smile when he's doing something evil or with Caroline. She then realised that he could be smiling because he was being evil.
But there is also Tyler and Stefan to consider. Tyler, she's still with, but things seem tense in that corner. And she seems to be really friendly with Stefan, so is it just friendship or is there something lying under the surface? It's all so confusing...