Mariah Carey is demanding James Packer buy her a mansion as part of their split.

Mariah Carey

Mariah Carey

The Australian billionaire recently called off their engagement leaving her "devastated", but she reportedly wants a house in Los Angeles out of their break-up and allegedly blames his pal Tommy Davis for the pair going their separate ways.

Sources connected to the superstar singer told gossip website TMZ that James, 49, has changed since he started spending time with Tommy, 44, who was the chief spokesperson of the Church of Scientology from 2005 to 2011.

One source has claimed to the outlet that James, who used to buy Mariah lavish gifts, enlisted the help of Tommy to help him stop spending so much.

James is expected to respond to Mariah's mansion demand later today (31.10.16).

The 46-year-old singer - who has five-year-old twins Moroccan and Monroe with her ex-husband Nick Cannon - is said to be seeking a $50 million settlement from James because she had to uproot her life and move to Los Angeles for him.

But a source close to the couple recently said: "Of course Mariah wants money, but she's not getting $50 million. There's no negotiations about money because they haven't spoken since the split.

"He let her keep the ring, and she isn't getting a cent more. It is ridiculous to claim that James is the reason for the cancellation of her South America tour. A few days ago she blamed it on the promoters."

Mariah was said to have been left "blindsided" when James called off their engagement.

Another source recently said: "The split has been devastating for Mariah. She loved James and was planning to marry him ... She made life changes for this man to prepare for their future as husband and wife, even relocating to Los Angeles, at James' request, so he could be closer to his children.

"Everything she has done over the past year is to prove how fully committed she is to their life together. She really wanted this to work. And then, completely out of the blue, it imploded."