Christina Applegate has been hospitalized amid her on-going battle with MS. Wonderwall.com can reveal the actress, 54, was admitted into a medical facility toward the end of March, but an official reason has yet to be confirmed. 'Long history of complicated medical conditions' Christina Applegate's rep did not confirm the reason for her hospitalization. By: MEGA "I have no comment on whether she is in the hospital or what her medical treatments are," her rep said.