The Sun Online can reveal the documentary maker has torn an intercostal muscle behind a rib just days into practising for her next dance.
She is under strict instructions not to move for a couple of days, meaning she won't have long to rehearse for Saturday night's show.
Stacey's agent revealed: "It's very painful. She is strapped up and the doctor has said she should be able to move in a couple of days."
The 31-year-old will see a medic this morning for an update on her injury.
Last night Stacey posted a picture of a woman wearing a cast over her right breast, arm and collar on social media.
It was captioned: "Current sitch" alongside emojis including a bandaged head, face-palm and distraught face.
Stacey – who is going from strength to strength on the BBC show alongside pro dancer Kevin Clifton – made fans fear she had broken a bone.
One said: "Oh no, hope you’ve not broken anything."
Another added: "What happened and I hope you can still be on strictly."
Someone else said: "Noooooooooo…what happened?!"
For Halloween Week, Stacey performed an incredible Doctor Who-themed Tango earning her an impressive 35 points.
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