Alison Hammond couldn’t hold back from grilling The Masked Singer judge Mo Gilligan over his wrong guesses when she took part in the competition.

Alison sung her heart out during the I’m A Celebrity special of the singing competition, in which she was revealed to be Witchetty Grub after bringing the house down with her cracking cover of Moving On Up by the M People.

The special saw judges Mo, Rita Ora, Davina McCall and Jonathan Ross return as they tried to guess which former I’m A Celebrity stars were behind the mask, with Vernon Kay going on to win as Koala.

Chatting about Mo’s new show, That’s My Jam, Alison and her This Morning co-star Dermot O’Leary were debating whether they were good enough at singing to appear as a guest, when Dermot reminded Alison: ‘Buy you did The Masked Singer, didn’t you?’

‘I did do The Masked Singer,’ Alison replied, before pointing at Mo and saying: ‘You actually thought I was Gemma Collins, and Katie Price!

‘No one guessed!’

Guesses included Katie Price and Gemma Collins! (Picture: ITV)

Alison revealed who she was after one performance (Picture: Instagram)

As Mo tried to excuse himself, saying he was certain the secret star was someone he had met before, Alison laughed: ‘Was it the chubbiness?’

‘I thought you were going to know,’ she added to Mo, who praised: ‘You were good on it though’.

Recalling getting booted out of the competition, Alison continued: ‘I didn’t get to do my second one though, I was going to do a Bob Marley tune, I was proper gutted’.

The judges had no idea! (Picture: ITV)

Shortly after performing on the ITV show, Alison revealed that it wasn’t as easy as it looked, and she actually ‘struggled’ to breathe.

She said: ‘It was a cute character but I’m gonna be honmest with you, it was one of the most challenging things I’ve ever had to do. Mainly because if you look at the costume, there’s a head inside another glass head.

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‘The amount of oxygen I had inside – it was like zero, I was really struggling. I had to literally play it down.

‘Those moves you saw me doing, that’s all I could do ’cause I just wasn’t physically capable to sing, be in those two heads and dance as well.’

This Morning airs weekdays from 10am on ITV.

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Alison was revealed to be Witchetty Grub on the I’m A Celeb special.