The Coronation Street actress, who recently filed for divorce from her actor husband Jamie Lomas, posted a photo of the work in progress on her Instagram page.
"Some new body art today. Can't wait til it's finished #workinprogress cheers @tat2stu," wrote Kym.
In the snapshot, the mother-of-three shows no sign of pain as her tattoo artist etches the art on her lower back.
Kym, 37, has given no hints as to what the new inking will be of, but it will no doubt have great meaning to her.
As a tattoo enthusiast, Kym has previously had ones done in honour of her children, among other designs.
Earlier this year, the small-screen star paid tribute to her and Jamie's stillborn son Archie, who they lost in 2009, with a tattoo on her shoulder. The pair have a two-year-old daughter Polly together.
"I've had a new tattoo in memory of my little Archie and in honour of all my children X," Kym tweeted at the time.
The tattoo joins the names of her teenagers David and Emily, who she had with builder and schildhood sweetheart Dave Cunliffe.