The news, broken by In Touch magazine, comes just three months after Braxton was forced to cancel a series of shows in Las Vegas following a health scare that led to hospitalization.
Braxton, who suffers from heart condition pericarditis, checked into a hospital in Las Vegas in April after experiencing chest pains. She has yet to comment on her latest health scare.
A spokeswoman for ABC, the TV network behind the hit show, has refused to confirm the latest lineup reports.
The official cast will be revealed on Aug. 25, and the new season of the dance competition will premiere on Sept. 22.
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