Singer Amy Winehouse clutched a large glass of red wine to her and tottered as she performed to an enthusiastic Spanish audience at the Rock In Rio music festival near Madrid.

Despite recently being diagnosed with early-stage emphysema, the singer, 24, gave a strong performance, backed by her band and two male vocalists.

As the 40,000-strong crowd applauded, Winehouse kicked off her high heels, picked up a white guitar and sang some of her best-known hits, including Rehab.

Sensationally, the singer admitted in a recent interview in Rolling Stone magazine that she had taken drugs during her stay in a rehabilitation clinic, where she went to tackle her addiction to alcohol and hard drugs.

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Red red wine: Amy Winehouse found comfort in a glass, but gave a strong performance

Fans will be wondering whether Amy's father Mitch hired minders to accompany her to Spain - after a burly minder was apparently on guard this week outside her London home, in what appeared to be an attempt to control Amy's wild ways. 

Mitch is reportedly trying to prevent his daughter from coming into contact with 'friends' and associates who may give her hard drugs.

Mitch's tactic didn't work, though, as Amy made a dash for freedom, jumping into a passing red convertible with two strangers, only to jump out again a couple of blocks later and spend the rest of the night in a favourite local music haunt.

Winehouse, who was recently an inpatient at private London hospital after fainting at her home, performed at Glastonbury where she appeared to scuffle with an audience member.

She told Rolling Stone magazine that she was bored and 'at a low ebb' whilst she waited for her husband Blake Fielder-Civil to come out of prison. Fielder-Civil is awaiting sentencing for grievous bodily harm and conspiracy to pervert the course of justice.

'A low ebb': Amy just wants her hubby to come home