OMG I totally hate the fact that the writers wrote in for Luke to have a child. First, he's not a main character, so he shouldn't even be messing with the flow like that. Second, I would much rather see Rory and Logan break up than Luke and Lorelai.
I'm hoping that maybe this girl's mom said something about Luke being the father b/c she wanted to have a good guy role model type, but in the end her father is the mom's one night stand or something. I really hope it's not true.