I remember reading an article a few years ago on the Destroyer Blog that argued, that we should stop caring about the sexual preferences of teen idols. I can’t quite remember anymore what the reasoning was (and I can’t find the post either, get a search function, Karl! :p) but it made a pretty good point.
I do believe though that there’s also an argument to be made about how out teen stars can have a positive impact on the lives of other queer teens just by being an example, someone they can identify with.
In either case, it’s fair to say that this should always happen on the terms of the star, they should have the choice in the matter and be able to decide if they want their sexuality to be a topic of public debate or not.
That being said… I think Kristian Kostov of very recent Eurovision fame came out in a more or less subtle way in a video (that he actually made before the Eurovision finals) with Australian contestant Isaiah Firebrace: