Metcalfe said her role was heavily based upon the US star's performance as Gabrielle Solis in Desperate Housewives.
She told the Daily Star: "I take a lot of inspiration from Eva. I created her from a mixture of Eva and people I’ve met throughout my life.
"There’s a little bit of me in there. But only a tiny bit."
Metcalfe first appeared in the Channel 4 soap in 2006.