Lateness is becoming a regular occurrence fitness-wise, in keeping with my current state of mind on the subject. It's the holidays, shouldn't we all just stuff our faces with great food and forget about fitness? Probably not. It's especially important to eat well and exercise during the holidays to combat stress and enter the new year feeling fabulous. Of course you should indulge, just remember indulgence is only good up to the point where we feel good; when the thought of another slice of cake makes you feel sick, it's time to stop.
P.S If this is hard for you remember some of the best advice I've heard about the holidays- Always wear something form-fitting, it'll be a great reminder of when to stop eating.