The casino mogul and the slender beauty, thought to be a 'Canadian model named Kylie', were spotted leaving world-renowned Japanese restaurant Matsuhisa.
The sighting comes amid reports that Mariah Carey's ex and the blonde have been seeing each other for 'several months'.
He said: "I was at a low point in my personal life. But it was a mistake for her and a mistake for me." Meanwhile, Mariah - who's known for her love of Christmas - shocked fans on Twitter after she told Ryan Seacrest to leave his Christmas tree up for another 7 months, claiming Christmas decorations can and should be kept up until July.
While the amount of Carey's settlement is unknown, a second source tells ET that she kept her $10 million engagement ring.
"She still has the ring and wears it now on her middle finger," the source reveals, adding that the former couple hasn't been on speaking terms for months.
Mariah Carey may have never said "I do" to James Packer -- but he's paying her for their split anyway.
A source tells ET that the 47-year-old singer received a "multimillion-dollar settlement" from Packer after their breakup.
Referring to Independence Day in the US, the trouble-making star wrote "Dahhling! Christmas nuts reluctant to bid farewell to the festival also thanked the singer for sticking up for it, with one writing: "Mariah Carey tells you to keep your tree up till July 4th, you keep your tree up till July 4th." But others were more Grinch-like, saying they'd already taken their tree down by December 28 this year.