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Packer proposed to Carey, according to the billionaire's close friend

The couple met in Aspen a couple of years ago, but got together last year

CNN  — 

Mariah Carey is canceling her Brussels concert over security concerns following this week’s terror attacks in the Belgian capital.

The Australian billionaire is said to have proposed to the American singer, seven months after they were first seen cozying up on a holiday in Italy.

“A close friend of Mr. Packer confirmed the couple were engaged and said they were over the moon that James has found such happiness with Mariah,” a source told CNN.

Worth about $3.5 billion, Packer, 48, is Australia’s fourth richest man, according to the Forbes Rich List. His family made millions through the media industry, before Packer turned to casinos. He owns one of Australia’s gaming and entertainment groups, Crown Resorts.

Carey, 45, dominated the pop charts in the 1990s, and is one of the best-selling music artists of all time.

On a U.S. talk show, she described how they got together.

CNN’s Yazhou Sun contributed to this report.