Beyonce and Jay Z are planning to buy a 123-room mansion to accommodate their growing family.

The couple - who have five-year-old daughter Blue Ivy together - recently announced they are expecting twins, and as part of their preparations for the new arrival, they secretly viewed an £85 million Hollywood abode belonging to heiress Petra Stunt and her businessman husband James Stunt earlier this month.

And the 'Lemonade' singer and her rap mogul spouse were said to have liked what they saw.

A source said: ''Beyonce and Jay Z are actively hunting for a house, something they can settle in for the next decade or so, and Petra's place seems to be very appealing to them.

''They were shown around two weeks ago and are thinking about whether it works for them.

''They know with their expanding brood it's time to get serious about laying some roots, and having a statement pad in Hollywood is at the top of their list.

''They loved the space and the size, they just need to work out if it's the right fit for the future.''

However, despite the vast fortune of Beyonce, 35, and her 47-year-old husband, they are reluctant to pay the asking price for the house.

The source told The Sun newspaper: ''They said they want to get a good deal though, so they were keen on getting the price down.''

The property is spread over 57,000 square feet and boasts 14 bedrooms and 27 bathrooms, and also has plenty to keep the family occupied, including an aquarium in the study, a bowling alley, swimming pool, a nightclub in the basement and even an entire room dedicated to giftwrapping.

The insider added: ''There's an amazing pool for the kids, gift-wrapping rooms, a screening room and a top-notch gym space, so it has everything they're going to need.

''More than anything they just want a pad that gives them the calm and serenity they need in their lives.''