The 42-year-old singer and her husband, Rene Angelil, also have a 9-year-old son, Rene Charles.
"Celine first announced the upcoming new additions to the Angelil-Dion family back in May, and now she just revealed that she is expecting twin boys," the Web posting said. "Congratulations to the happy family!"
Notable deaths of 2014 [PHOTOS]
S Club 7 to reunite for BBC charity event