Although she's been very involved in the pregnancy, Tina claimed a few weeks ago that she had been kept in the dark over the babies' genders.
The singer gave birth to the twins in a Los Angeles-area hospital some time last week, according to multiple sources.
He used several hashtags, including #beyonce, #jayz and #twins.
The new additions bring the superstar family count to five, as they join the power couple's 5-year-old daughter Blue Ivy.
The "queen of pop"'s father Matthew Knowles, with whom she has had a strained relationship, posted a birthday message to the twins, captioned "They're here!" and signed "Love, Granddad".
"Assassination list" with Republican names found on James Hodgkinson's body
A former mayor of Alexandria, William Euille, told CNN that he saw Hodgkinson around the YMCA, and described him as a " loner ". Capitol Police officers credited with saving Scalise and others at the field, sustained a gunshot wound to her ankle.
While the world is waiting for one of Beyonce's stunning announcement Instagram posts confirming this news, fans worldwide can relax a bit, thanks to the deductions made by the singer's greatest fans.
In 2012, the birth of the couple's first child, Blue Ivy, caused a media sensation, leading New York's Lenox Hill Hospital to shut down part of its maternity wing to accommodate music's royal couple.
The image took over the internet, becoming the most-liked Instagram pic of all time with 6 million+ views within 24 hours of its posting.
Beyonce and Jay Z have yet to commented on the big news.
Though Knowles is grandfather to the twins, the 65-year-old found out about Beyonce's pregnancy via social media just like the rest of the world.