The actress started getting Botox jabs to help ease painful migraines and now she's a huge fan of the cosmetic injections to her forehead, which help to iron out wrinkles.
She tells InStyle magazine, "I have a dermatologist who gives me Botox very sparingly.
"Actresses, admit it. Everybody knows you're using Botox. Just stop using so much of it."
And Madsen, 45, insists Botox and a workout regime she picked up from Cher help her to stay looking young.
She explains, "Cher was the first woman I met who was working out consistently. She directed me in a video and looked so fabulous... She was very disciplined.
"Going to the gym is like insurance for your body. I actually look younger now than I did 10 years ago."
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