Dance Moms’ star Abby Lee Miller has cancer. The 51-year-old TV personality has been diagnosed with non-Hodgkin’s lymphoma, a cancer that afflicts the immune system. It was discovered during emergency surgery on Tuesday. It's a scary turn for Miller, who was once famous for drama at her dance studio. Her doctor says Abby, who is living in a halfway house following her release from prison for bankruptcy fraud, will undergo chemotherapy or radiation.