After the Anti debacle I don't believe HDD about anything.
They were right about it though. Rihanna's team did keep delaying it. Not to mention, they were the only place with exclusive news about Adele's album. Everything they said about it came true.
Tons of these artists mentioned in this thread can't even book the Grammy stage which means they're not megastars. Anyways it's either recent Grammy winners Beyonce or Legend X.
I didn't know performing at the Grammy's was the criteria for being a megastar. I guess we can add Demi Lovato to the discussion, since this GP favorite megastar also performed at the Grammy's