British singer Amy Winehouse arrives at Westminster Magistrates Court in central London July 23, 2009. Winehouse is accused of assaulting a woman in London in September last year. [Agencies]

Amy Winehouse screamed and spat at a young teenager she believed was bullying her goddaughter.

The livid 'Rehab' star reportedly stormed to London's Southgate school on Monday (21.09.09) to confront a pupil who had been tormenting 13-year-old Dionne Bromfield.

A source said: "The altercation outside of the North London secondary school quickly turned sour when Amy began hurling abuse at the young accused bully and began spitting at her."

Celebrity gossip blog I'm Not Obsessed added: "Amy's tirade did not stop there, as witnesses say that the 26-year-old then went on to shout at a group of Dionne's fellow students."

The altercation was eventually stopped by a passer-by who managed to calm Amy down. The 26-year-old singer then agreed to sign autographs before leaving the school.

The website added: "The brawl was finally broken up by a concerned bystander. After signing some autographs for waiting fans, Amy was eventually persuaded to return home, much to the relief of Dionne's fellow students."

Amy - who is preparing to release Dionne's debut album on her own label Lioness Records - recently spoke about her close relationship with the teenager and predicted she will enjoy a long music career.

She said: "She's a great songwriter and guitarist but I want her to experience life so she can write more.

"Singing songs that are so personal, it's deep. But she knows what she's doing. To be honest, when I say Dionne's like my sister, a lot of the time she's like my older sister."