The 32-year-old, who plays barmaid Roxy Mitchell on the BBC One soap, confirmed that she has enjoyed getting to know the drama's latest recruit in recent weeks.
Former Dempsey & Makepeace cast member Barber landed the part of Glenda Mitchell last month. Glenda is the ex-wife of sinister Archie (Larry Lamb) and mother of Roxy and Ronnie (Samantha Womack).
In an interview with Inside Soap, Simons explained: "It's amazing how much Glynis looks like Sam. It's made me decide that I look like Larry! Ronnie got Glenda's genes and Roxy got Archie's.
"I'm getting on really well with Glynis. Glenda's a typical Mitchell woman. She's a fiery one and very similar to Ronnie in personality as well as looks."
Barber was cast as Glenda after The Gentle Touch star Jill Gascoine stood down from the part following one day on set. She will be seen on screen for the first time in the New Year.