They have remained in hospital due to a "minor issue" and doctors were not comfortable with sending them home just yet. A source told People magazine on the same day: "Bey and Jay are thrilled and have started sharing the news with their family and closest friends".
Beyonce shared her baby bump photo and captioned it, "We would like to share our love and happiness".
Former Destiny's Child star Beyonce, 35, revealed she was expecting twins with an Instagram post in February. We have been blessed 2 times over.
Are Beyonce and Jay Z parents again?
The nursery apparently costs $500,000, with Beyonce and Jay Z knocking out a wall between two of their bedrooms to provide a huge "master suite-size nursery" for the twins.
Beyonce's father confirmed on Twitter that the pop diva has indeed given birth to twins but instead of rejoicing in the news, her fans chose to get angry.
Rumors emerged about the births over the weekend, prior to Mathew Knowles' announcement, after two unidentified women were spotted delivering balloons reading "it's a boy" and "it's a girl" to the hospital. And many fans in the Beyhive said they were reserving their excitement until the announcement was Instagram official.
In recent months, we have seen the interpreter of Single Ladies to be radically transformed by pregnancy. He used several hashtags, including #beyonce, #jayz and #twins. Time for me to move to NY.
She later told People magazine: "I feel more lovely than I've ever felt because I've given birth".