REHAB singer Amy Winehouse needs to learn how to say “No! No! No!”

Just four days after checking out of London’s Priory Clinic, after a week of treatment to battle an alcohol addiction, she was back in her local boozer – “flailing drunkenly” around the beer garden.

Wearing tatty tracksuit bottoms and a vest, 27-year-old Amy spent Sunday afternoon with chums necking beer in the Edinboro Castle in her old North London stomping ground of Camden.

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An onlooker tells me: “Amy was a bit of a mess and hadn’t made much effort with her appearance.

“Despite it being a chilly afternoon, she was wearing a tiny vest and drunkenly flailing about, having several very loud, animated – almost shrieking – conversations with a pal.”

Amy, who remains an outpatient of the Priory, is due to play the first of several Eastern European dates in Serbia on June 18.