Selena Gomez has been an open book about her lupus battle, and on Friday, the 25-year-old singer revealed how her diagnosis changed her outlook on life. While promoting her new film, Hotel Transylvania 3, with costar Andy Samberg on Good Morning America, Selena said she doesn't "really think about anything that causes me stress anymore" and she doesn't even live in LA anymore. Selena underwent a kidney transplant surgery last Summer. Even though she initially kept the news private, she later used her platform to thank pal Francia Raisa for donating her organ and raise awareness about lupus. See what else Selena had to say in the video above.