[Spoilers Extended] What would everyone’s reaction to Jon’s parentage be?

Truth be told, I doubt the knowledge of Jon not being Ned’s bastard would reach that many people. But just for entertainment and discussion purposes, what do you guys think would be the rest of the characters’ reactions finding out about it? Such as Theon, Jaime, Littlefinger, Sam etc

I know it’s unrealistic and it would be pointless, but I would love to read Cersei’s thoughts upon learning that not only Lyanna Stark “ruined her marriage” but also had a son with the man of her dreams lmao