The Masked Singer UK fans are certain they know which celebrity couple are Cat and Mouse on the ITV series.
Singers and married couple Martin and Shirlie Kemp are tipped to be unmasked as the costume duo this series, after some major clues.
Six acts took to the stage on Sunday night in costume, including duo Cat and Mouse.
They were joined by Ghost, Jellyfish, Phoenix, Knitting and Otter, going head-to-head to impress the studio audience and the panel.
Ghost was unmasked as Chris Kamara on the night, leaving the panel stunned and viewers thrilled.
Now, Pepsi & Shirlie singer Shirlie and Spandau Ballet and EastEnders star Martin are the duo most fans appear to believe are under the Cat and Mouse costumes.
Viewers believe the clues given in episode one were enough to go on, while they currently remain undetected by the panel.
Clues included the number 20,000,000 written on a notepad and "knowing how to spin a tale", while Cat said he was "no stranger to legalities".
They sang Anything You Can Do, while their clue VT also revealed a load of spices - before their final riddle teased: "I’m on the case, I’m not afraid, you stole the cheese, and some Jade."
Some of the clues, fans suggested, could be linked to being a talent show judge, which Martin has been, while others appeared to link one of them to the Spice Girls.
Shirlie actually appeared in a Spice Girls music video for their song Mama, while Martin was a judge on BBC's Let It Shine.
Clues aside, there's also the fact both of them are singers and they've even duetted before - releasing an album together in 2019.
On hearing back some of their tracks, the vocals do sound very alike to those of Cat and Mouse.
Taking to Twitter, viewers shared their theories with many convinced they had cracked the case with Martin and Shirlie.
One viewer said: "So intriguing to have a duo! I’m guessing Martin & Shirlie Kemp for Cat & Mouse. Martin has been a judge on talent shows (legal clues) and Shirlie was in the Spice Girls video for Mama."
Another agreed: "Cat & Mouse are Martin & Shirley Kemp innit," as a third fan said: "martin and shirlie kemp maybe?"
A fourth fan tweeted: "Throwing my hat in early on this @realmartinkemp @Shirliekemp," while a fifth said: "cat and mouse is the kemps - Shirlie and Martin."
Other theories thrown into the mix include RuPaul's Drag Race stars RuPaul and Michelle Visage.
The Masked Singer continues next Saturday at 7pm on ITV1 and ITVX
