The BBC reports the Garda (Irish police service) are investigating to see if a crime has been committed by the artist.
Irish twitterers were quick to jump into the debate:
@RTEcraic (Ireland) Guerilla artist hangs nude Cowen paintings: Nude paintings of Taoiseach Brian Cowen were snuck into two of Dubli.. http://tinyurl.com/cozo2m
@phil_revahealth (Dublin, Ireland) Did you see the "well hung" paintings of Brian Cowen on RTE News? That sub editor deserves an award! http://short.ie/kpikx8 (Click on )
@AndrewParnell (Dublin, Ireland) HIlarous - look away now if you don't want to see Brian Cowen naked. http://bit.ly/vxrk
@sineadgleeson (Dublin, Ireland) Wondering who painted those naked pictures of Brian Cowen and snuck them into two galleries? http://tiny.cc/EyZap
@JamesCarroll09 To be a bit more philosophical on Twitter - what do you all think of the picture in the National Gallery of Brian Cowen? Bit crass+sad??
@ananelson (Dublin, Ireland) Never thought I would have reason to google "naked taoiseach".