Mariah Carey and James Packer Have Not Ended their Engagement

Singer's rep addresses rumors that she and the Australian billionaire split.

The singer's rep told "Entertainment Tonight" that Carey and Packer had a fight during their vacation in Greece last month, and she has not seen him since.

"The fight was not because of any cheating allegations or excessive spending by Mariah," the rep said, while noting that Packer, a 49-year-old billionaire, is "one of the most successful businessmen in the world."

"They are trying to work it out," Carey's rep added. "Right now, they’re not sure if they will stay together."

She said the couple plan to release an official statement once they've determined their future.

A rep for Packer told ABC News, "This is simply untrue."

Carey, 46, and Packer, an Australian casino mogul, got engaged in January after dating for nearly a year. According to Vogue, he proposed with a massive 35-carat diamond ring, designed by Wilfredo Rosado.

They first met in 2015 in Aspen at the premiere of "Hercules."

But the pair have not been spotted together in weeks, and Carey last posted a picture of the two of them about a month ago.

Carey is currently in the midst of her Sweet Sweet Fantasy Tour. Her E! docuseries, "Mariah's World," will debut Dec. 4, with Packer scheduled to appear in several episodes.