From Illuminati connections to faked pregnancies, Beyoncé has inspired a lot of conspiracy theories. But the latest one might be the craziest: Online sleuths believe the Lemonade superstar, 34, is holding Sia hostage and forcing her to write songs! (The eccentric “Cheap Thrills” singer, 40, has written four hits for Bey, including “Pretty Hurts.”) The bizarre tale seems to have originated on Brazilian social media after Sia described working with Beyoncé as a “camp” where songwriters are holed up in separate rooms of a house and then visited by Queen Bey for feedback on their work, plus a glass of water and some bread crusts if their lyrics are good (OK, we made that last part up). Fans soon shared alleged deleted tweets from Sia in which she appeared to…