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11 May 2018, 12:03 | Updated: 4 November 2018, 10:16
Fans were impressed with the This Morning host's vocal abilities - despite joking she couldn't sing 'like Kerry Katona'.
Holly, 37, performed a rendition of Atomic Kitten's Whole Again with Heart's Spice Girl and Celebrity Juice co-host Fearne Cotton on Thursday night's show.
However, the trio's band name was a world away from the squeaky clean pop groups of the 90s, with Keith Lemon christening the improvised girl group 'Cat Flaps'.
To which Holly then replied: "Me, I definitely can't sing."
The performance comes a day after Holly posted a teaser video on Instagram saying it was a 'dream come true.' She captioned it: "@celebjuiceofficial ... making dreams come true! @emmaleebunton @fearnecotton #girlband #spicegirls."