June 19 (UPI) -- Beyoncé's dad says the singer has indeed welcomed twins with husband Jay Z.
Mathew Knowles angered fans by announcing Sunday on Father's Day that the 35-year-old music superstar recently gave birth.
"They're here! #beyonce #jayz #twins #birthday #happybirthday," he captioned an image on Twitter and Instagram reading, "Happy Birthday to the twins! Love, Granddad."
Social media users took issue with Knowles sharing the news before Beyoncé. The star herself has yet to confirm she welcomed her second and third child.
"@MathewKnowles That was for Beyoncé to tell not you," one person chided.
"@MathewKnowles they aren't here until Beyoncé tells us they're here," another added.
Us Weekly reported Saturday that Beyoncé gave birth to twins earlier in the week. The singer and Jay Z have slowly been spreading the news among family and friends, according to People.
"Bey and Jay are thrilled and have started sharing the news with the family and closest friends," a source told the magazine.
Beyoncé and Jay Z are already parents to 5-year-old daughter Blue Ivy.