Fans on Twitter have pointed out that Gigi Hadid deleted a supportive tweet she sent to Hailey Baldwin following Justin Bieber‘s Lyme Disease diagnosis. In a tweet on January 8, Hailey thanked Gigi, her sister Bella and their mom Yolanda Hadid after the family helped to educate her about Lyme Disease. You may recall that the Hadid family are advocates for awareness about the illness as Yolanda, Bella and Anwar Hadid all have it.