"I am so amazed at this journey," Knight, 67, said upon learning her fate.
"It's been absolutely extraordinary. I learned so many things, found so many friends and family. I'm just overjoyed."
Her professional dance partner was Tristan MacManus.
Still in the running for the coveted mirror-ball trophy, along with their partners, are actress Melissa Gilbert, actor Jaleel White, football player Donald Driver, "Extra" host Maria Menounos, Disney Channel star Roshon Fegan, actor-model William Levy and singer Katherine Jenkins.