Ora is an English singer, songwriter and actress who wrote to fame in 2012 on the DJ Fresh single, Hot Right Now.
She is the first British female solo artist to have 13 top 10 songs in the UK.
McCall is an English televise presenter and model, best known for presenting Big Brother between 2000 and 2010.
Comedian Joel Dommett will present the series.
Speaking to the standard online, Dommett said: “It such a process for the people who are in the costumes. They had to be so secretive.
There was a lot of rehearsing and performing and nerves and stuff like that and I think a lot of them when they talked about the reason they were doing it – it was for their kid – and the fact that they knew their kids would love to do such a fun and different thing.”
The Masked Singer starts tonight at 7pm
