TMZ has learned ... following her big Halloween soiree, Mariah's staff packed up her stuff and moved it to Packer's Beverly Hills home. She probably got a good deal with the movers ... Packer's house is only 5 minutes from the house she's been renting.
It's a big move for Mariah and the Australian billionaire ... we're told they've openly discussed the end game ... marriage.
BTW ... Mariah took a lot more than clothes. Bedding, furniture, the works. Looks like James' mansion is about to get some new flair.