The singer headed to a studio in London on Wednesday (29Ap15) to audition a long line of hopefuls all vying to become the face of communication company O2's latest promotional drive.
Harding says of her new job, "I was delighted to be asked by O2 to be on the panel. I am a huge cat-lover and am often posting pictures of my Persian cat, Marley, on Instagram and Twitter - he's a huge part of my life... We have seen some incredibly smiley cats from all over the country and I can't wait to see the winning cat up on a billboard in London, what a great opportunity!"
The winning entrant, who is deemed to be Britain's most friendly-faced feline, will star in the O2 Refresh advertising campaign and win a year's supply of cat fod. The winner will be unveiled on 21 May (15).