Francine Lewis impersonates 'EastEnders' stalwart Pat Butcher when she doesn't want sex.The 'Britain's Got Talent' impressionist takes off the BBC One soap's former hard-nosed matriarch - who was portrayed by Pam St. Clement for 26 years until her departure last year - when she is not feeling frisky, but impersonates brunette beauty Cheryl Cole when she is keen for some action in the bedroom. She said: ''I can be quite raunchy and being an impressionist definitely helps -- when I want sex, I'm Cheryl Cole or Marilyn Monroe. ''But it works both ways -- when I don't want it, I'm Pat Butcher!'' The mother-of-two has promised to impersonate one of the 'BGT' judges - Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon - when she appears on tonight's (31.05.13) 'BGT' live semi-final, and if she makes the final she is going to take off one of the British royals. She added to The Sun newspaper: ''I'd definitely do the Queen and some of the other royals -- maybe Kate -- as well. ''Getting to the final would be absolutely amazing. ''I'm really excited about tonight's show although I am nervous too. I've had nightmares about getting things wrong. ''I'm hoping that as soon as I've got my first laugh everything will be OK.''