Ed Balls said he is traumatised by the blunder he made during his first dance on Strictly Come Dancing.
The former shadow chancellor and his professional partner Katya Jones performed the waltz as their Strictly debut.
Mr Balls recounted the moment "disaster struck" and he missed a step as they whirled around the dance floor of the BBC One show.
Writing in the Radio Times he admitted: "My mind went blank, I missed a step and panicked.
"We improvised to get back on track, got to our standing spin early and had to add an extra turn to let the music catch up. The rest of it went fine, but I was traumatised - how could I have messed up and let everyone down?"
His wife, MP Yvette Cooper reassured him saying no-one had noticed his error.
He continued: "Yes, I was bottom of the leaderboard, but it wasn't a total disgrace - not a bad start for a middle-aged novice. And when I listened back to the judges' comments, they were actually quite encouraging."
This past weekend Mr Balls was praised for his second dance, a Charleston which earned him a standing ovation from the Strictly audience.
Strictly judge Bruno Tonioli told him it was a "comeback that Tony Blair would be proud of".
Read the full interview in this week's Radio Times