Editor's note: The publisher of Lynne Spears' book has denied that she discusses Britney's virginity loss in her upcoming book. Click here to read more.

In a new tell-all book, Britney Spears' mother says she was "not that innocent" long before Justin Timberlake, according to excerpts published in the U.K.'s Sun on Thursday.

Spears' mother, Lynne, says her daughter lost her virginity to a high school football player when she was 14, the report says.

Lynne Spears, 53, also says Spears began drinking when she was a 13-year-old Mouseketeer and began experimenting with drugs at 15, according to the Sun.

By age 16, Britney was caught with cocaine and marijuana on a private jet, Lynne Spears claims, according to the Sun.

The book, "Through the Storm: A Real Story of Fame and Family in a Tabloid World," is set for release Sept. 16.

Lynne also says she regrets of losing control of Britney's career to handlers who promoted her as a sex object and put her in raunchy videos, the Sun says.

She admits she allowed her then 16-year-old daughter to sleep with Justin Timberlake, her Mickey Mouse Club co-star, and went along with the hoax that Britney was a virgin and saving herself for marriage.

In 2003, Timberlake told reporters, "She lost her virginity a while ago — and I should know." He also told Barbara Walters that he gave Britney her first kiss.

Lynne Spears reveals Timberlake was misled and that Britney lost her virginity to a Kentwood, La., high school football player, the Sun says.

Click here to read more in the Sun