A little bit of a stretch since she is young and all but Fergie "Fergie" Duhamel is acting a bit weird lately with this interuption at the "Trevor Live Gala" and then another one at the same Gala
http://www.eonline.com/news/897857/unpredictable-fergie-crashes-the-stage-twice-at-trevorlive-gala
And she has recently come out saying that she used to use meth, i mean she did just go through a divorce with a kid. Maybe she turned back to her old habits?