I told all of my relatives about my pg with DD at my (pg) cousin's wedding! It was such a special time for the family and my cousin was just so pleased we were sharing our pgs that she didn't mind at all. We actually told them all the day before, when we arrived, so it wasn't done in front of everyone, but of course lots of ppl didn't hear about it until the day.

I think it would depend on your relationship with your BFs. Sounds like they won't mind at all and will be excited.