Selena Gomez is sharing an important health update. The "Only Murders in the Building" star set the record straight after fans were concerned over her hands appearing to shake in a recent TikTok video. Sel reassured well-wishers in the comment section that the symptom was just a side effect of her medication for lupus, and teased in a lighthearted reminder that she "ain't no pro" when it comes to skincare tutorials.