Miss Universe officials have a message for Catalina Robayo, Colombia's entry into Monday's contest: Don't forget to wear underwear.

Robayo, one of 89 beauties from around the world competing to win the Donald Trump-owned contest, has been reprimanded for making appearance in tiny skirts - with no panties.

"Colombia had to be spoken to and told she needed to wear underpants as what she was doing was totally inappropriate," a source told Fox News. "People have been pretty upset by it; there have been photos and media appearances where she has completely had her crotch out."

The contest, being held in Sao paulo, Brazil, might benefit from controversy, but going commando goes too far.

"Our supervisors talked to all of the contestants about dressing appropriately, and one of our PR people spoke to [Robayo] and apparently she said she was wearing underwear, said Miss Universe President Paula Shugart. "But regardless, it created quite a stir here for a few days."

The pageant earlier returned bikini bottoms from sponsor Catalina Brasil Swimwear after they were ruled too skimpy for network television.

The contest airs Monday at 9 pm ET.