A representative for the 30-year-old actor confirmed on January 15 that the couple will be welcoming twins, reported Ace Showbiz.
The baby is due this spring.
Hemsworth and Pataky, 37, are already parents to a baby girl India Rose, Richard who will turn two this year.
The couple announced in November that they were expecting their second child, but they did not say anything about having two babies on board.