There's an idiom that's on the tip of my tongue, but I don't remember what it is. I remember it as "His star is shining" but I'm not sure that's it, I may be confusing it with something else. it's supposed to mean that he's having a good period or he's reigning, and everyone is adoring him. Does that sound familiar to anyone?
You may be referring to the expression :
to be the shining star, that is to be the most promising or attractive person in a specific context.