The EastEnders actress made her debut as Max Branning's secret wife Kirsty in an hour-long Christmas Day special. Wareing told The Mirror's We Love TV that the bombshell storyline meant she wasn't able to share her excitement with her friends.
"Only my father, brother and my agent knew," she explained. "When the Christmas Day episode screened, I watched it with my family on holiday in Lanzarote. I got lots of calls from friends who were extremely surprised."
Talking about Kirsty, Wareing commented: "She's very bitchy and lippy - a real stirrer who's absolutely full of herself. However, I think it's all a bit of an act. When she's on her own, you see Kirsty is more vulnerable."
Wareing said that while she has played a number of "wrong 'uns" in her career, she "wouldn't have it any other way".
"I don't want to play boring characters. With baddies like Kirsty, I get to sob, scream and really get my teeth into it," she said.
The 37-year-old also revealed that she has watched the soap since she was a child and said it was "nerve-wracking" being on set with characters she had grown up with.
"It's been like a weird dream and I keep expecting to wake up any minute. I've worked with lots of famous actors, but this is the first time I've been starstruck," she added.
Wareing recently admitted that she drew on her own experiences of domestic abuse for an upcoming storyline in the show.