I guess I'm lucky in that I rarely know who any of the celebrities are, and I love watching it for the professionals as much as the celebrities anyway! I find not knowing anyone helps me develop favourites over the series, as I can watch how they progress and how entertaining they are both in the dancing and on It Takes Two.
I's a shame you're not watching It Takes Two, as I think this years ITT has been much better than the last couple of years. They haven't had any celebrity "fans" on so far this year - you know the ones who just come on to promote their latest film/TV series/play/single/CD/tour, and they've concentrated on the contestants plus people involved in the series, such as production runners, lighting directors, set makers, costume designers etc.