It depends on your philosophy. If your mindset is "I want to get this weight off before such-and-such date, and I'll do anything to do it - I'm movitated", then try to avoid it.

OTOH, if your philosophy is, "The weight will come off eventually, I'm not going to put off living until some arbitrary future date when I'm 'thin enough', I'm going to live life to the fullest," then a little in moderation is certainly okay. It will probably slow your weight loss, since you're close to your goal. That last 10-20 lbs is stubborn.

I'm a social drinker, too. Canadian daughter of a Welshman. So I know how you feel.