Beyonce and Jay-Z have splashed out $600,000 on childcare for their twins

A source told US OK! magazine: "The twins don't sleep at the same time, so she decided she needed three per child, working in eight hour shifts."

Despite her recent lack of sleep, the 35-year-old singer - who also has five-year-old daughter Blue with the rapper - is said to be "full of energy and life" around her twins.

A source said: "Beyonce is amazing, she is clocking hardly any sleep right now, but she's full of energy and life!

"Most new moms of twins struggle to even function at this stage, but Beyonce is thriving.

"I mean, obviously it helps that she and Jay-Z have nannies and a bunch of staff, but she's still really hands on and she's breastfeeding, which means she's hardly getting a break rest wise - but then, Beyonce has always functioned best on less sleep than most of us mere mortals!"

When the 'Halo' hitmaker isn't looking after her twins and catching up on some sleep, she has been busy working on regaining her pre-pregnancy figure and the results are said to be impressive.

The insider added: "You would never believe that Beyonce gave birth to twins just weeks ago.

"She's lost nearly all the baby weight, and her body has snapped right back ... She looks awesome!"

Beyonce and Jay, 47, appear to be able to afford their new nanny spend after it was reported earlier this year they are worth a staggering

$1.16 billion between them.