As already mentioned, the Princesses are there for breakfast, lunch and dinner. We usually go there for dinner and the Princess interaction is great.
However, they don't always have the same princesses each time. We do find that Belle, Princess Aurora and Cinderella were there during each of our visit. We find that Jasmine, Snow White and Ariel were there some of the time. And we did have Alice and Prince Charming with Cinderella (although, by reading the other threads, this may have been a one time fluke) once.
Either way, they will have one Princess in the Front for photos and 4 others ones will visit your table. I find that this is a great way for my daughter to see her favourite princesses without the line ups.
By the way, at CRT, dinner is not Character Dining but the Fairy Godmother, Perla and Suzy has always made an appearance during our dinner there. They don't necessarily go to each table, but you can take photos of them. One time, Perla (or is it Suzy) came over to my daughter at the table and asked her if she wanted a photo with her. I suppose, technically, they don't stop at each table. They are in and out rather quickly. The Fairy Godmother usually just asks for anyone celebrating. And they do a song and then they're gone. I suppose that's why they don't call it a Character dining. But, I think they try to make the dinner special by adding that little bit.