Christie Brinkley admitted using Botox on her face was a "disaster".
The 61-year-old model is a fan of using Botox on her neck to smooth wrinkles but insisted she will never have it in her face again as it left her expressionless.
She said: "Having Botox injected into my forehead was a disaster. Looking back, I don't even know why I bothered. Instead of making me look serene and relaxed, Botox took the arch out of my eyebrows and made me look sad. My face lacked expression and I couldn't wait for the effects to wear off. I never tried it again in my forehead.
"But more recently, I noticed vertical bands in my neck that were particularly obvious with side lighting. I didn't like them, so I asked about what could be done, and apparently the easiest way to address this issue was to inject small amounts of Botox into the 'strings' in my neck.
"It worked wonders to relax those muscles and it also tightened my double chin area and jawline. The best part is that you don't have to worry about any expression being lost or changed."
Christie also revealed she uses fillers to maintain her youthful appearance but opts for "super-tiny doses".
Writing in the Mail on Sunday, she said: "I have used fillers in super-tiny doses, and just like make-up, the best ones are imperceptible.
"Used well, they can give the overall face a lift and also diminish fine lines. I've used them on an indentation on my forehead - the legacy of a playground accident - and also on marionette lines around my mouth. But you must use a very small amount because over-filling removes contours and gives you a flat face."