Judge Motsi Mabuse has had to withdraw from Saturday's edition of Strictly Come Dancing due to UK covid guidelines.
She was contacted by NHS Test and Trace and, as a result, will be replaced on the BBC One show by Cynthia Erivo.
A statement from Strictly Come Dancing said: "We can confirm Motsi Mabuse will not be taking part in Strictly Come Dancing this weekend.
"We are delighted that Cynthia Erivo will be joining us as a guest judge again, joining Craig Revel Horwood, Anton Du Beke and head judge Shirley Ballas on the judging panel.
"We look forward to having Motsi back with us next weekend."
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The Germany-based Motsi Mabuse said she would normally be exempt from isolation because she is double vaccinated and has had a booster but her German vaccines are not recognised in the UK.
She said in a statement on Instagram: "I must follow UK Government guidance and can only return after 30 November 2021 to UK.
"Our health is the most important thing and luckily I have been tested multiple times this week and am negative.
"I am healthy, I am with my family, that's what matters."
