The Masked Singer semi-final saw two more singers unmasked.
After each character had performed one song, Fox was eliminated from the competition by the voting studio audience - and she was revealed to be former Big Breakfast presenter Denise Van Outen.
The remaining characters then sang one more song each and Monster was revealed to be American singer, songwriter and record producer CeeLo Green.
Denise had some viewers foxed by her identity in the secretive ITV singing show, which sees celebs perform in disguise as a panel try to guess their identity, while others guessed who she was from the very first episode.
Denise, who has performed in the musical Chicago in London's West End and on Broadway, said it was the "best thing I've ever done."
"It's been fun slinking around," she said.
"I'm going to miss the Fox."
The unveiling of five times Grammy Award-winning CeeLo, whose hits also include Forget You, also didn't come as a shock to many because of the distinctive voice behind the monster hit Crazy.
"Knew it," said one fan.
"CeeLo Green as monster on The Masked Singer was the worst kept secret of the entire series," said another.
So far EastEnders star Patsy Palmer was unveiled as the Butterfly, Chameleon was The Darkness singer Justin Hawkins, Pharaoh was unmasked as former home secretary Alan Johnson, the Tree was former England footballer Teddy Sheringham and Daisy was singing superstar Kelis.
Last week Duck turned out to be Skin the lead singer of rock band Skunk Anansie and the sassy Unicorn was revealed to be Jake Sears from the band Scissor Sisters on the ITV show that's had the nation talking.
Next week, Hedgehog, Octopus and Queen Bee will all perform in the final.
Fans think Hedgehog could be Salford comic Jason Manford or Pointless presenter Alexander Armstrong and Phillip Schofield is another guess.
Octopus is believed to be classical singer Katherine Jenkins and viewers think former Girls Aloud singer Nicola Roberts is most likely to be Queen Bee, or Jesy Nelson from Little Mix.
The Masked Singer returns on Saturday at 7pm on ITV.
