Sir Cliff's penthouse was raided last week while the entertainer was on holiday as part of an investigation into an alleged sexual assault on a boy under the age of 16 at a religious event in 1985.
Now Cilla has spoken out to defend the singer, saying she believes the allegations are 'without foundation'.
Cilla Black and Cliff Richard
She told the Mirror: "Cliff is a very close friend of mine and has been for a million years.
“I, like everyone else, was shocked to hear of these allegations and I am absolutely positive that they are without foundation."
Cilla isn't the first star to come out in support of the 73-year-old singer.
Cilla Back and Cliff Richard have been friends since the sixties
TV presenter and broadcaster Gloria Hunniford, said: “I’ve never seen Cliff put a foot or a word wrong in his life, never. He is a gorgeous man.”
And earlier this week, Michael Parkinson criticised the BBC over their coverage of the story, comparing the broadcaster to a tabloid in its 'witch hunt' reporting of the police search of Cliff Richard's home.
He told ITV News: "I think anybody not charged should not be named by the police, and shouldn't be reported in the newspapers either in my view.
"I think the Cliff Richard case only highlights the feeling there is some kind of witch hunt going on.
"I think the BBC did create an error in judgment, not in understanding the story and having the story and trying to follow it through, but in reacting to the story in a kind of way that would have done the red tops credit."
Cliff, who is currently at his home in Portugal, has strongly denied any wrongdoing, branding the allegations 'completely false'.
He is expected to fly home within days to face the allegations after police officers reportedly made contact with the singer’s lawyers to confirm they wanted to speak with him.