Aguilera's father reportedly told Life and Style magazine that he's excited about the impending birth.
A rep for Aguilera told The ShowBuzz "we are not confirming."
A source told the New York Post last month that the singer had been telling friends the news.
The 26-year-old Grammy-winning singer married music executive Jordan Bratman in 2005. They got engaged in February of that year.
Earlier this year, Aguilera herself explained to Ellen DeGeneres how she and her husband keep their relationship lively. "You have to keep marriage alive, spice it up," she said. "We do everything naked (on Sundays). We cook naked."
Photos: Celebrity Parents
The singer, who is on tour with her album "Back To Basics," is due to perform in the Philippines on Friday.