Singer-actor Selena Gomez responded after fans spotted her "shaky" hands in a recent TikTok video of her applying skincare products on her face. "I shake because of my medication of Lupus," the 30-year-old wrote in response to a fan on TikTok. Gomez was diagnosed with Lupus, an autoimmune disease, in 2014 and also underwent a kidney transplant in 2017.