Heidi Montag is terrified her breasts will harden.

The former 'Hills' star - who famously underwent 10 cosmetic procedures in one day, including having her chest increased to a huge G-cup - gives her breasts regular massages to keep the implants soft and has urged other surgically-enhanced Women to follow her lead.

She tweeted: "Giving myself a soft tissue breast massage. Ladies we have to keep those implants soft."

The 23-year-old beauty also revealed that out of all of the cosmetic surgery she had, having her ears pinned back was the most painful.

She tweeted: "Warning: to anyone who is thinking about getting their ears pinned. I learned after the fact it is the most painful surgery a person can get."

Heidi recently admitted that she wishes she could reverse her numerous surgeries but fears she will never be able to undo the effects of her operations after her surgeon, Dr. Frank Ryan, died in a car accident in August.

She said: "I feel trapped in my own body. There's just no fixing it. Dr. Ryan knows the work he did, he knows everything."

The blonde star - who wears nose tape every day because she is terrified it will Cave In - claims to feel "crushed" by her breast implants and is desperate to have them reduced.

She recently admitted: "My boobs are crushing me. My body's still getting used to them and I have major anxiety about it. I was taking painkillers but they weren't working so I stopped. It hurt either way.

"I'm desperate to go back to normal. I'm downgrading and going a little smaller, to a D or a double D.

"I'm obsessed with fitness but it's impossible to work out with these boobs. It's heartbreaking. I can't live an everyday life."