It was a Christmas-time romantic comedy sort of novel. Here's what I remember: the heroine had auburn hair, and she had a love/hate relationship with the hero. The hero had dark hair (dark brown I think) was very neat, posh, (almost preppy), suit-and-tie kind of guy whereas she was almost the opposite. She was a do-gooder type, always volunteering for charities and stuff. She had a friend who's name started with B, who was obsessed with her boyfriend and thought up names for her future children with him, and he was a jerk I think. He might have even cheated on her now that I think about it. Near the end of the book the hero dresses up as Santa to make children happy, and he does this for the heroine and it's really cute, then they kiss etc, etc. I remember all this but I just can't remember the TITLE of it! :( I really liked this book as a young teen, and I'd really appreciate any help. Thanks in advance!
I'm curious about why you think the hair color is so important and will help find the title of the book. It's possible a librarian might be able to help you with this.