Amy Winehouse has cancelled her U.S. tour following her decision to quit rehab at the weekend.

The 23-year-old singer has postponed touring the States next month so that she can "address her health issues" - however she is determined to fulfil her UK dates in October and November.

The Back to Black star walked out of The Causeway clinic in Essex on Sunday night for the second time in a week.

She was seeking treatment following a drug overdose.

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Amy Winehouse has said no to rehab (again) and touring the U.S. next month as she wants to 'address her health issues'

"Amy, who is talking time out to address her health issues, has been advised to postpone her September U.S. and Canadian tour dates," the statement issued said.

"Amy's European and UK dates in October and November remain in place," it added.

Winehouse and husband Blake Fielder-Civil left The Causeway together following a string of blazing rows.

"It (The Causeway) is supposed to be a peaceful backdrop to help people deal with their problems," a source told The Sun.

"But Amy and Blake kept rowing and spoiling the ambience.

"While Amy would be welcomed back with open arms, I'm not sure they'd say the same for Blake.

"Everyone is really worried that if they are let loose in London again they'll just go straight back to their old druggy habits," the source added.

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Amy and husband Blake Fielder-Civil returning to The Causeway last week after the singer quit the first time round

Her latest decision to quit the £10,000-a-week rehabilitation centre will be a bitter blow to her parents, Mitch and Janis, who blame Fielder-Civil for their daughter's cocaine and heroin addiction.

"This should be about Amy getting help - but too often it's all about Blake," the source said.

Winehouse collapsed after a three-day drug and drink binge on 8 August and was rushed into A&E.

At the time she described the overdose as "one of the most terrifying moments" of her life and finally agreed to enter rehab on 13 August following crisis talks with her parents and in-laws.

However within 48 hours, Winehouse had quit and was seen back in her local pub in north London's Camden area with her husband and in-laws.

The couple - Winehouse would only agree to seek help on the proviso Fielder-Civil was with her - returned to the centre on 16 August.

"He (Fielder-Civil) upset people in The Causeway with his behaviour. It was the same when she was in hospital.

"He really upset the staff and wasn't very welcome there either," the source revealed.

Fielder-Civil recently complained that he was fed-up with being "portrayed as the bad guy".

He added: "I love her so, so much. She's so precious to me, she's my wife and I want to take care of her."