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Mariah Carey, James Packer

PacificCoastNews

Mariah Carey and James Packer have shifted their relationship into full gear!

E! News has learned that the "Always Be My Baby" singer and her billionaire boyfriend have moved in together, but she's still holding onto her digs. "Mariah did move into his home but is still keeping her home as well," the source tells us. "They spend so much time together, so it only made sense."

She and Packer have been dating for only five months, but the twosome became serious fairly quickly. They're so into each other, in fact, that they're even talking about tying the knot!

"They have been speaking about marriage as well," the insider adds. "They are very much in love and things couldn't be better."

The two spent a ton of time traveling the globe this summer, which only deepened their love for each other. Whether they're vacationing in Ibiza or hanging out in Malibu, Calif., the couple only wants to be with one another.

Mariah Carey, James Packer

Evan Agostini/Invision/AP

"They get along amazingly and their communication is always fluid and easy," another source shared with E! News in June. "James is very into Mariah, though, and he wants to spoil her and her children every minute he can. He feels she only deserves the best."

The source continued, "James has been speaking to his family and friends back in Australia a lot about Mariah. This is just the beginning of their relationship and they are both excited about what possibly can be ahead for them in the future."

Over the summer reports claimed that the couple was already thinking about getting hitched, but E! News learned that it wasn't true at the time. "They are not talking marriage. That's ridiculous," a source close to the singer told us. "She's enjoying his company, but she's also trying to remain cautious. This trip is a chance for her to really get to know him. She hasn't 100 percent let him in yet."

That, obviously, has since changed! There's nothing like a whirlwind summer to speed things up a bit.

Congratulations to the happy couple on the big move!

Check out Mariah's glam look during her night out with her boyfriend.