"We would like to share our love and happiness", Beyonce captioned the stunning shot, which caught fans by surprise.
The couple recently celebrated their ninth wedding anniversary and have a 5-year-old daughter, Blue Ivy.
Neither Beyonce, one of the world's most popular singers, nor her husband, the rap star and entrepreneur Jay Z, has made any announcement about the birth.
Beyoncé gave birth to her first child, Blue Ivy Carter, on January 7, 2012, a Saturday.
Beyonce's twins will reportedly have an incredibly lavish nursery complete with their own planetarium, fireplace, and cinema. Increasing the rumours further, Beyoncé's sister Solange Knowles had been spotted at the Los Angeles medical centre rumoured to be where the couple is having the children, according to reports on Thursday.
A representative for Beyonce did not immediately respond to requests for comment. The sex (es) of Bey and Jay Z's newborns have not yet been revealed. We have been blessed 2 times over.
The newest member of the Carter family is here. However, their twins, a baby girl, and a baby boy have been kept in the hospital for minor issues.
Beyonce and Jay Z got married in 2008.
Since then, social media has become a "hive" of activity surrounding the topic.
Following her pregnancy announcement, Beyonce was forced to pull out of headlining the Coachella music festival in April on doctor's orders and will instead appear at the event in 2018.
"I felt very maternal around eight months", she told Vogue.
This post was syndicated from Nigeria News and World Healdines - The Guardian Nigeria Newspaper - National and International News. Queen B. would be in good shape but would have liked to stay with them.
Download the Nigeria Today app from Play store.