Kris Allen -- Don't Blame Me for Thong, Song

That "angel pink mesh" thong on Kris Allen's wedding registry -- consider it a surprise from his wifey, because he had no idea it was even on there.

The "American Idol" winner talked about the saucy unmentionables on 104.3 MYfm today -- but the best part... his politically correct, but completely insincere answer about Kara DioGuardi's heinous finale song.

Just listen "between the lines."