The Star reports that, because there is no time for a costume change, the 35-year-old will have to "jump about" in the same clothes she's wearing on the panel.
A source explains: "Cheryl and Oti want to look sexy and glam, but having to jump about doing a physical routine has caused them last-minute problems.
“They’re busy with the team’s stylists looking for something that won’t lead to any Janet Jackson Super Bowl-style blunders.”
Janet famously exposed her right breast to more than 100 million viewers at the American football show in 2004 during a performance with Justin Timberlake.
It sparked a scandal called 'Nipplegate' which led to Justin coining the phrase "wardrobe malfunction" to describe what happened.
Tonight's edition of The Greatest Dancer will see all nine acts perform – with the audience having to choose one to send home.
Viewers will find out who's getting the boot as tension builds on the BBC One talent show from 7.30am.
But before that, all the show's dance 'captains' have to get up on stage and perform a group routine with the nine remaining acts as the show goes live for the first time.
Ex-Girls Aloud star Cheryl sent fans wild last week when she posted a picture with an unknown man in a mirror's reflection.
But Cheryl has revealed the man wasn't a love interest like some hoped and was actually just a member of the Greatest Dancer crew.
She told the Mail: "It was actually just the sound guy coming to hurry me up while I stood having my picture taken."
Posing in cream combat trousers and a khaki, off the shoulder jumper, the TV judge smouldered for the camera.
The mum-of-one racked up over 70,000 likes, with many excitedly questioning who the phantom fella could be.
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