Selena Gomez has had several hit songs this past year from "The Heart Wants What It Wants" to "Good For You" to "Same Old Love," all of which seem to be about her past relationship with Justin Bieber. Tonight, Gomez, like Bieber, is a performer at the 2015 American Music Awards. She's performing her song "Same Old Love" and is joining a lineup that includes 5 Seconds of Summer, Celine Dion, Carrie Underwood, Jennifer Lopez, and many others. Gomez previously cancelled musical performances because of her battle with Lupus, but is back in action and better than ever. Some associated her illness with cancer because she was on chemotherapy, but this is not the case. For more information on Gomez, click through our gallery to celebrate her AMAs gig.