Matthew Knowles has confirmed that his daughter, Beyoncé, has given birth to twins – and, in doing so, has sparked fury among some of her fans.

US media outlets had reported that the Single Ladies singer and Jay Z had welcomed two siblings for daughter Blue Ivy, but the pair have yet to announce the news or make a comment.

However, in the way of all excitable parents, Knowles couldn’t resist letting the world know that he was a granddad again.

“They're here! #beyonce #twins #jayz #happybirthday,” he wrote on Twitter and Instagram.

And, as if that wasn’t clear enough, Knowles added an image of a digital card that reads, “Happy Birthday to the twins! Love, Granddad”.

Beyoncé’s father confirms that the twins have arrived (much to the ire of fans)