There are certain questions those who are regularly interviewed need to be ready to answer. They're the questions that are in the grab-bag of every tired, lazy reporter working a beat, questions like, for example, "What's the most embarrassing thing that ever happened to you on stage?"
Apparently, Fergie's handlers haven't prepared her properly, and when asked the above question she responded not with a charming-but-innocuous story of the time she tripped over one of her back-up singers and bruised her left boob, but by recalling an actually humiliating event that she would prefer people forget: the night she peed her pants on stage.
Whether she can live it down is largely a function of whether she keeps bringing it up.
I mean, if she's going to talk openly about the event, she might as well do an adult diaper endorsement deal and make a few bucks off of it.