The 24-year-old singer performed Fun.'s We Are Young with her artists last week, but messed up the opening of the show after her mic was apparently malfunctioning.
“I think Will.i.am saw there was so much competition," Becky joked this week. "All the blokes got together and said, ‘Switch off Jessie’s ear pack’.”
But she added: “Of course it didn’t happen.”
Becky meanwhile blamed the "pressure" of the show for her own musical malfunction last Saturday night, after she swore on live telly when forgetting the lyrics to the song.
She told The Sun: “The pressure got to me. I’ll try not to do it again.”
Becky will be performing on The Voice UK semi-finals tonight.