Selena Gomez [1] has been an open book about her lupus battle [2], 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 [3], with costar Andy Samberg [4] on Good Morning America [5], 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 [6] last Summer. Even though she initially kept the news private, she later used her platform to thank pal Francia Raisa for donating her organ [7] and raise awareness about lupus. See what else Selena had to say in the video above.