Louisa Johnson has laughed off suggestion that she mimed on the X Factor at the weekend.

The singer, who won the show last year, returned to the stage to perform her new single 'So Good'.

However, some Twitter users believed the Brit was lip-synching to a backing track.

Speaking on Twitter on Monday (October 31), Johnson said that she was providing genuine vocals.

She said: "I mean, sorry that i can sing live? Should i be sorry? Lmao."

Johnson released 'So Good' on Friday (October 28).

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Watch Louisa Johnson on the X Factor below: