The girl who forgot to wear her underwear: Miss Universe Columbia 2011 (Catalina Robayo)

At the pre-show appearances, Catalina Robayo had apparently worn no underwear and what's worse was that her embarrassing moment was captured on camera, making front-page news of a local paper. It was also reported that Catalina was reprimanded by the Miss Universe officials to wear underwear to avoid impropriety. As of now, Catalina Robayo has a Facebook fanpage entitled 'The pantyless Miss Universe'.