Speculation on just who are behind the costumes on The Masked Singer is rife, but some fans are already convinced that Kate Bush is a contestant on the series.

The fourth season premiered on Sunday night and while six celebrities took part in the first round of battles, it was former pro footballer Chris Kamara who left after being unveiled as Ghost.

Judges Rita Ora, Mo Gilligan, Davina McCall and Jonathan Ross will also be tasked with trying to also guess the 13 celebrities across the season, but so far other characters Cat & Mouse, Jellyfish, Knitting, Otter and Phoenix remain masked for the time being.

But there are still plenty of questions over just which famous faces are behind the other masks, and now some fans are certain that they’ve cracked the identity of another contestant.

On the show, Otter sang the Baywatch theme song I’m Always Here, which lead some people to believe it was Kate belting out the song because of the unique vocals.

As one fan speculated: ‘Can’t believe we live in a world where it’s entirely possible Kate Bush is on The Masked Singer UK’.

Some The Masked Singer fans are totally convinced Otter is Kate Bush (Picture: ITV)

‘I felt a fool suggesting it earlier but now I’m convinced that’s her voice and diction.’

Another wrote that: ‘Kate Bush not being seen in public for years and then revealing herself under an otter head makes absolutely 0 sense but I hope it’s true.’

While others weren’t quite convinced, they seem to be holding out hope for the reveal.

Another joked it could be possibly that the budget went towards securing her, because it ‘went somewhere’ and it ‘wasn’t on’ Chris’ costume, which has been labelled as ‘lacklustre’.

Meanwhile other people have totally shut the theories down.

Kate had a notable 35 year break from live performing (Picture: TREVOR LEIGHTON/FISH PEOPLE/AFP via Getty Images)

‘Kate Bush hasn’t sung live on television since the 90s and you think she’s gonna make her re-debut to TV in an otter costume singing someone else’s music?’ some-one posted.

What are the clues for Otter?

Clues for Otter included a swimming pool with a sign that had words including ‘diving’ on, while fans noticed the first letter of each word spelled out RADA, which could stand for The Royal Academy of Dramatic Art.

Others included a rubber duck, being ‘a little bit naughty’ and a four leaf clover.

Otter also said they were known for their ‘resilience’ and suggested they were known for making a splash – while their final riddle was: ‘Children, some say, should be seen and not heard, but of this Otter, I’d say, opposite is the word’.

Last year Kate enjoyed a resurgence in popularity this year after one of her signature tracks, Running Up That Hill, featured in the Netflix show Stranger Things.

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Despite being released 37 years ago, it managed to soar to the top of the charts and reach number one after it was used as a soundtrack to Max Mayfield’s (Sadie Sink) survival towards the climax of season 4.

Next week’s show will see Fawn, Jacket Potato, Piece of Cake, Pigeon, Rhino and Rubbish perform.

The Masked Singer continues on Saturday at 7pm on ITV.

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Could Kate be behind the costume?