Sam Lufti's lawyers have said that she also 'overdosed' on prescription pills

Lawyers for Britney Spears‘ former manager Sam Lufti have claimed that the pop singer was addicted to amphetamines.

Speaking to Los Angeles Superior Court, attorney Joseph Schleimer said: “She liked to use amphetamines. Mostly everything that went wrong was because of this drug.” Schleimer also claimed that Spears had “a prescription for amphetamines, and overdosed on them”.

Lufti has alleged that Spears’ shaved her head in 2007 in order to avoid taking a drugs test, after she believed that traces of the drugs she was taking – including crystal meth – would be in her hair.

Lufti – who was Spears’ manager for eight years – is currently suing Spears and her parents for defamation, breach of contract and libel, reports The Independent.

He is seeking millions of dollars after claiming that Spears’ mother’s book Through the Storm: A Real Story of Fame and Family in a Tabloid World, which was released in 2008, said he drugged Spears and manipulated the singer and her family.

Schleimer told the jury: “My client was made a scapegoat for drug abuse and erratic behavior of Britney Spears.”