Beyonce and Jay Z aren't ''rushing'' in to having more children.

The 'Crazy In Love' hitmaker and the 45-year-old rapper - who already have a three-year-old daughter Blue Ivy together - are reportedly holding back from adding to their brood as they are already struggling to juggle their careers and the demands of parenting.

A source said: ''So, Jay and Bey are not rushing into things because they feel like they are still young and can put it off for a bit!

''They had been trying but settled down, because they are so busy with their careers and parenting Blue as it is.''

They are also said to be leaving the decision up to their firstborn, who is yet to ask them for a sibling.

The insider added to HollywoodLife.com: ''Speaking of Blue they are kind of putting it on her. Blue hasn't asked Mommy and Daddy for a brother or sister.''

Meanwhile, Beyonce's former Destiny's Child bandmate Michelle Williams was forced to deny rumours the blonde beauty was expecting again earlier this year after she posted an image of a baby bump sculpted out of sand online.

She said: ''You know, when she was pregnant, people said that she wasn't pregnant. There's just no truth to it. Sorry!''

In September, Jay Z also seemed to hint himself that his wife was expecting another child during a performance in Paris where he altered song lyrics to allegedly sing, ''cause she pregnant with another one,'' although the claim was later dismissed.