Movie beauty JESSICA BIEL says she'd never consider plastic surgery - even though she's terrified of growing old.

The 26-year-old says she's already feeling the signs of ageing, but would never consider going under the knife.

She says: "I am really afraid of blades on my face. Freaks me out beyond belief. I would way rather have wrinkles than have some slice-up going on."

The Texas Chainsaw Massacre star is a fitness fanatic, but she fears she will have to slow down her exercise regime because she's waking up each morning stiff and in pain.

She says: "I feel my knees changing - like, why do I have this pain when I'm running on the treadmill? What's going on with my lower back when I wake up in the morning? I just feel changes.

"And I'm definitely fearful in a very vain manner about my body aging. I think it's freaky weird to look at a picture of your grandmother when she was a young woman and look at her now."

But Jessica, who is dating JUSTIN TIMBERLAKE, has no intention of undergoing surgery to preserve her looks.