"The situation in Chiapas and Tabasco has really become a forgotten emergency," Aiken said in a statement. "Telling the story of these brave people, especially the children, to a U.S. audience is the reason that I am here. Sharing this experience with my family during this time of year makes it even more special."
Torrential rains in Tabasco and Chiapas in one weekend last month produced the worst flooding the region has seen in more than 50 years.
More than 1 million residents of the two states have been affected, one third of which are children, UNICEF said.
While the situation has been stabilized through the efforts of Mexico's government and U.N. agencies, thousands remain homeless and displaced.