The classical singer - one half of Britain's Got Talent runners-up Jonathan & Charlotte - tripped over during rehearsals for Red or Black?.
Jaconelli performed with her singing partner alongside fellow Britain's Got Talent act Only Boys Aloud.
"It was really great to get up and perform on Red or Black? after appearing on Britain's Got Talent," she told The Sun.
"Apart from when I fell off the podium in rehearsals when the pyros went off.
"I'm scared of fireworks and I ducked for cover, lost my balance and hit the stage floor."
She added: "I'm not sure whether people thought they should help me or just laugh. I was laughing hysterically."
Jonathan & Charlotte release their debut album Together today (September 24), featuring covers of songs by Take That and Muse.