An interjection used to say 'see? (I told you so)' — expressing 'I was right' or 'look' (often mildly reproachful).
ほらね、言った通りでしょ？
See? I told you so, didn't I?
試してみたら簡単だったよ。ほらね、心配しすぎだったんだ。
I tried it and it was easy. See? You worried too much.
ほらね、ちゃんと届いたよ。
See? It arrived properly.