The 26-year-old singer is believed to have checked in to a top clinic earlier this week in Londons Harley Street to restore her sexy cleavage.

The Back to Black singer boasted stunning curves when she first burst onto the music scene back in 2003.

But after years of alleged heroin abuse her body has been left looking emaciated.

Amy, 26, is understood to have undergone the op earlier this week ahead of her planned TV comeback on hit BBC1 show Strictly Come Dancing.

The op comes as the global star slowly comes back to full health, and tries to regain confidence in her body.

She will appear tonight as a backing singer for her 13-year-old goddaughter Dionne Bromfield. She has signed to Amy's own record label.

Last night unconfirmed reports suggested she may have paid as much as s35,000 for the op to boost her chest from 32B to 32D.

A spokesman for Amy last night confirmed she had been in hospital, but said it was for a routine procedure.