As the 56-year-old made his way on to the stage with his professional dance partner Amy Dowden, Brian seemed to misplace his footing.
The entertainer fell head first up the stage stairs leaving host Zoe Ball in shock.
Not one to make a fuss, Brian cooly picked himself up and slouched down on the It Takes Two sofa.
Zoe, 46, gasped: "We're going to be in so much trouble!" as the contestant pretended to be in agony.
Strictly Come Dancing 2017: Shirley Ballas suffers KNICKER FLASH
Strictly Come Dancing 2017: Joe McFadden 'suffers INJURY in training'
Brian tripped up the It Takes Two stage
Brian joked that he had hurt himself in the stint
Amy called her dance partner "so naughty" as Zoe wondered if one of their competitors had tripped them up on purpose.
Brian was saved from the dance off in last week's show as Reverend Richard Coles was the second celebrity to be eliminated.
However, his success wasn't without controversy as reports emerged suggesting he had an "unfair advantage" over his competitors.
Brian's brother Alan works on the show, forcing the entertainer to slam rumours he is getting "special treatment".
Strictly Come Dancing 2017 in pictures
Mon, October 9, 2017
Strictly Come Dancing 2017: See Charlotte Hawkins, Ruth Langsford, Debbie McGee, Gemma Atkinson and more celebs waltz their way to victory on the BBC dance show.
1 of 86
Strictly Come Dancing 2017
Elsewhere on the dramatic instalment of It Takes Two, head judge Shirley Ballas suffered an unfortunate wardrobe malfunction.
The 57-year-old not only showed off her dancing skills, but also her underwear during an impromptu performance with Kevin Clifton.