Cheryl will be singing live during Sunday night's results show and X Factor choreographer Brian said the Geordie is spending all her time perfecting her vocals and moves.
Speaking to us last night, Brian revealed: "At a rehearsal on Wednesday, Cheryl wanted more time. She stayed in there more hours than originally planned and she's putting in a lot of work.
"I know she wants it to be a great performance."
Brian is working with Cheryl as her choreographer and insists that, although the singer is nervous about her big moment, she's also really excited too.
And he's even compared her to huge stars Britney Spears, Beyoncé and Janet Jackson! Praise, indeed.
"We were talking about her nerves and she was saying she loves that feeling of butterflies in her stomach," Brian said.
"We were talking about if and when that feeling ever goes away - it's a bad thing if it does. She's still got that, so I know she's really excited to hit the stage."
Referring to Britney and co, Brian added: "There's a certain type of artist that as a choreographer you want to have in the studio.
"Britney has that, Janet Jackson had that, Beyoncé has that, and Cheryl has that too. She's in that category by far. She is it."
Brian confirmed that Cheryl will be singing live this weekend, adding that her new hubby Jean-Bernard has been by her side to watch her prepare for her performance.
"She's been singing and dancing in rehearsal live, she's been singing and dancing every time we run it," Brian said.
"JB is so supportive of Cheryl and he has a great personality. He sits next to me in the live show and it's really nice to see."
However Brian admits that he has not got to grips with the X Factor judge's new monikier, laughing: "I don't call Cheryl by her married name, I just call her Cheryl actually, that's it!"
Last weekend, Cheryl reportedly hit out at the X Factor warm up act for calling her by her former married name Cole.
You've been warned, Mr Friedman - better get practicing!
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