Mariah Carey gushes about her billionaire boyfriend

Mariah Carey is head over heels for billionaire boyfriend James Packer.

The singer couldn’t stop gushing about her Australian beau during an appearance on “The Steve Harvey Show” on Tuesday, all the while flaunting her dazzling diamond necklace from Packer, 48.

“Oh, this old thing,” Carey, 45, joked when pressed by host Harvey about the piece of jewelry. “[It was] a very, very big surprise, really nice.”

The couple, who made their red carpet debut at the premiere of “The Intern” in September, have been going strong since April. Though, as Carey shared, they’ve known each other for quite some time.

“We first met in Aspen,” she revealed. “A couple of years ago we were at the ‘Hercules’ premiere. We were talking and laughing and people were getting mad at us and stuff like that. So we hit it off.”

After Harvey, 58,  playfully deadpanned, “Ain’t he lucky,” a glowing Carey nodded in agreement.

“I’m lucky too.”