Mariah Carey dedicates 'Hero' performance to James Packer in Las Vegas

Nothing says this romance is serious than a song dedication by a diva.

That's right, Mariah Carey belted her heart out to 'Hero' in Las Vegas for billionaire boyfriend, James Packer. Aww, bless them.

Check out the video above to get involved with their smushy love story, which will leave you wondering…is this really all a dream? And when will I wake up and normality will be resumed?

The unlikely couple stepped out together in Italy in June and since, it's been non-stop romance for the pair.

They've spent the past month on board his multi-million dollar yacht, just getting their pash on. Yep, life is hard for the rich and famous.

And now she's letting us all know it's super serious. Well, you don't sing the powerful lyrics of 'Hero' to just your casual fling, do you?