Lance Bass and his fiance got a huge surprise at famed gay club, The Abbey, last night -- a his-and-his bachelor party ... complete with penis party favors!
Lance and Michael Turchin were toasted by celeb friends like Joey Fatone, Alan Thicke, Cheri Oteri, and comedian Fortune Feimster.
The guys sipped drinks out of penis-inspired yard glasses. If you're wondering, the answer is ... circumcised.
We talked to Lance after the party, and he reluctantly showed off one his more PG-rated souvenirs. Mazel!