The superstar singer shows off her baby bump on Instagram as she says her "family will be growing by two".
Beyonce has posted an image of herself cradling her belly on Instagram to announce she is expecting twins.
"We would like to share our love and happiness. We have been blessed two times over," she wrote.
"We are incredibly grateful that our family will be growing by two, and we thank you for your well wishes."
The statement was signed "The Carters".
Beyonce and her husband Jay Z, real name Shawn Carter, already have a daughter, Blue Ivy, who was born in 2012.
She revealed that pregnancy at the MTV Video Music Awards in 2011.