I don’t believe in conspiracy theories. I will say that stars generally check into hospitals under pseudonyms and never want it to be known it’s for cosmetic purposes - although in Joan’s case the cat is obviously out of the bag, lol. I remember when Streisand had her face done, she walked around LA wearing a beekeeper’s veil!
As a friend of mine once replied when I asked if a certain star had plastic surgery: “Either that, or a childhood fire.”