Mariah Carey's billionaire beau gifts her $500K diamond necklace

Mariah Carey sure is one luck gal as her billionaire beau James Packer recently decorated her chest with 500,000 US dollars worth heart-shaped diamond necklace.

Packer gifted the 18 karat yellow sparkler right before the 45-year-old star's Vegas show, and Carey thanked him for the new heart, TMZ.com reported.

The 'Without You' star had previously declared her love for her billionaire boyfriend during 'You're Mine' star performance in Las Vegas.