Former 'Real Housewives' Star Alex McCord -- Sues Bedding Partner for $100 Mil -- Pillow Fight!

Former "Real Housewives of New York" star Alex McCord claims she got screwed under the sheets ... and the woman scorned is now out for REVENGE!

McCord and her husband are suing a woman who they claim stole their business right out from under them -- a business that makes a ridiculously expensive, Egyptian cotton bed and bath line.

McCord claims she created her very successful business -- called Aluxe -- with Vivian Douek ... and
things were going swimmingly. But then McCord claims Douek went rogue, secretly starting a competing business and ultimately stealing all the customers.

McCord says in her lawsuit Douek was so bold ... she even used the same Egyptian manufacturing company.

Short story -- McCord says she and her partners now have a business that's hanging by a thread count, claiming Aluxe has lost $100 MIL in sales this past year.

Sheet happens.