The `Piranha 3D` star - who split from England rugby star Danny Cipriani in June after almost two years of dating - is preparing to audition for a secret stage project so has not had time to date anyone.
She told the Daily Telegraph newspaper: "I`m still single and not really looking at the moment as I`m so busy with work.
"I`m also reading for a top-secret play in a few days` time. It`s going to be an all-women show, but I can`t say more than that or I`ll get told off."
As well as being too busy to date, Kelly recently admitted she enjoys being single as she can be "selfish" and has more freedom to do what she wants.
She said: "I`m travelling so much. It`s a perfect time to be single and be selfish and do what I want. I`d have done it sooner if I`d known it was this cool."
The 30-year-old brunette beauty also wants to throw herself into creating her own fashion line.
She said: "I`d love to design my own range. I love the 50s look."
The model-and-actress stripped off for Playboy magazine earlier this year and recently admitted she is now so comfortable with being naked that it "terrifies" her to wear clothes.
She said: "I`m so used to it now that I`m more terrified of putting my clothes on. I haven`t got any huge body hang-ups. I`ve got to the age where I`ve accepted all flaws. I know I`m never going to be perfect."