Britney Spears had sex at 14 and started taking drugs aged 15, according to her mother. Lynne Spears' shocking revelations also include claims Britney began drinking at 13 and was introduced to drugs when she went to Los Angeles to record her first hit.
The "Toxic" singer was even allegedly caught with cocaine and cannabis on a private jet when she was just 16.
Dispelling claims Britney lost her virginity to her former pop star boyfriend Justin Timberlake, Lynne says in her book "Through the Storm" her daughter first had sex with an 18-year-old American football player while she attended her local high school in Kentwood, Louisiana, for a year before becoming a teen pop star.
Lynne admits she allowed Britney, aged 16, to sleep with Justin.
A source told Britain's The Sun newspaper: "Lynne thought Britney was in love and Justin was good for her."
Lynne claims her daughter experimented with alcohol after joining Disney TV show "The Mickey Mouse Club."
Lynne - who has had a turbulent relationship with Britney since she split from ex-husband Kevin Federline in 2006 - admits in the memoir she regrets handing control of Britney's career over to her managers and allowing her to be promoted as a sex object at the age of 17 in the music promo for "Baby One More Time."
Lynne, 53, believes Britney's behavior as a teenage star led to her public breakdown earlier this year, which involved her being put in a psychiatric hospital twice and losing custody of her two children, Sean Preston, almost three, and Jayden James, 23 months.
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