Speaking on ITV's This Morning, Denise said her character Karin - who is described as a sassy businesswoman - wastes no time in getting acquainted with Max Branning.
"She's got history with Phil Mitchell and all will be revealed soon," said Denise. "She's looking for Phil to start with and the she meets Max Branning."
"She's a strong woman. She knows exactly what she wants and she goes into Albert Square to ruffle feathers. She knows how to manipulate the men, let's just say!"
Denise said she had to kiss Strictly Come Dancing star Jake Wood in her first scene on set.
"Some people like to really go for it," she explained. "We we were acting but with passion. You have that discussion whether you include tongues and there were no tongues involved, at this stage."
Denise added: "It's a really fun part and to go into something like this, you want a really fun character. The cast work so hard and they're all so lovely."
Watch Denise's debut on EastEnders tonight at 7.30pm on BBC One.
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