The best topics are stupid crap about celebs and what's going on in their personal lives. I think its stupid to care that a complete stranger drove while drink or cheated or farted, but there's a lot of empty people out there that need this sort of thing to fill their tiny little brains up with pointless knowledge like that.
if you want to make a website with a hot niche in my opinion it depends on your interest , may be you like internet marketing then it's getting hot niche for you , all of things depend on you. the best niches are health herbal , make money , entertainment . good luck
Really, if you are planning to run the site yourself it is better to be about something you are interested in. It WILL become a pain, especially with blogs if you don´t care about your subject.