"Mariah and Nick have converted a whole wing of their Beverly Hills house into a luxury nursery,' says a pal. Mariah wanted 18-carat gold trim, with ivory walls, soft furnishings and walk-in wardrobes full of Petit Trésor designer clothes. There's a top-of-the-range sound system and they'll each have diamond-encrusted iPods and a flatscreen TV that comes down from the ceiling."

The twins will sleep in Chelsea Sleigh cribs, £1,390 each, while Mum and Dad relax in Glam Glider chairs at a knockdown £1,420. And there's a Clara changing table, worth £1,780.

"It might seem over the top, but Mariah has waited 
a long time for her baby dreams to come true and 
she says the twins will be 
the most spoilt kids on 
the planet."