Mariah Carey and fiance James Packer at it again before her vegas show

It was their first Valentine's Day as an engaged couple but it was also a regular old work day for

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Mariah Carey and James Packer. 

The pop superstar had to go on and perform a show Sunday as part of her Las Vegas residency at Caesars Palace.

But the supportive Australian billionaire made sure to make the night special by being there for his beautiful bride to be.