Can you imagine what these two international superstars would produce? My guess: The most adorable single ever.I know you’re bummed that Charice has yet to make her highly anticipated return to Glee, but I’ve got some news that MIGHT just take your mind off Sunshine Corazon’s tragic absence: Charice, 18, wants to make sweet, sweet music with none other than Justin Bieber! “Why not?” Charice, 18,