The 35-year-old singer and her husband Jay Z – who already have five-year-old daughter Blue Ivy together – were believed to have welcomed the two newest additions to their brood,  a source confirms to PEOPLE.

“Bey and Jay are thrilled and have started sharing the news with their family and closest friends,” the a source said.

They sparked speculation their twins had arrived when JayZ failed to show up for the ceremony where he was inducted into the songwriters hall of fame.