Samantha Who? star Christina Applegate has been diagnosed with an early stage of breast cancer. "Benefiting from early detection through a doctor-ordered MRI, the cancer is not life-threatening," her publicist said in a statement on Saturday. "Christina is following the recommended treatment of her doctors and will have a full recovery." Christina is expected to maintain her regular filming schedule for her TV show while she undergoes treatment. The star is also scheduled to appear on the September 5 Stand Up to Cancer telethon.