Harper, 74, became famous for her role as Rhoda Morgenstern on "The Mary Tyler Moore Show."
She was given just three months to live last March. That was five months ago. She was diagnosed with leptomeningeal carcinomatosis, a rare form of cancer in which cancer cells spread into the membrane surrounding the brain.
Even with terminal brain cancer, she has lived longer than her doctor predicted.
"Dancing with the Stars" is an extremely physically-demanding reality show, but sources report that Harper is doing well. She and her partner, Tristan, have already started practicing for Season 17.
TMZ also said others who will be joining Harper are Leah Remini, Snooki, Elizabeth Berkley, Amber Riley from "Glee," Christina Milian and Jack Osbourne whose sister, Kelly, won third place in 2009.
The entire cast, along with their partners, will be announced on ABC's "Good Morning America" on Sept. 4.
"Dancing with the Stars" returns on Monday, Sept. 16 from 8 p.m. to 10 p.m. with a one night, two-hour format. A couple will be eliminated at the end of each episode by combining the judges’ scores of that night with the public votes from the previous week which will determine who gets eliminated every Monday night. This is a big change from previous seasons.
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