Oh, that's a great question! It's always nice to show your hairdresser some extra appreciation during the holidays. The amount you tip will depend on the quality of service they provided and how often you visit them. A good rule of thumb is to give at least 20% of the total bill as a tip. If you have a particularly generous hairdresser, you could even give them a bit more! After all, they've helped you look your best for the holiday season!