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Palin's teen daughter 'wanted to get pregnant'

Levi Johnston writes in his upcoming book that his ex-girlfriend Bristol Palin was so angry about her mother's pregnancy with son Trig that she wanted to get pregnant too.

Johnston says when Bristol found out her mother, former Alaska governor Sarah Palin, was expecting a baby she saidshe should be having a baby, not her mother. He says she told him in March 2008, "let's get pregnant".

His book, Deer in the Headlights: My Life in Sarah Palin's Crosshairs, comes out on September 20.

In Bristol Palin's own book, Not Afraid of Life: My Journey So Far, released last June, she says she lost her virginity to Johnston on a camping trip when she got drunk.

Johnston says in his book if that's when Bristol first had sex, he "wasn't there". He says they did camp with friends but it was "well after" the two, who began dating in 2006, were sexually active. He says he remembers an instance in which Bristol wanted to get alcohol but he was against it because she would "lose her judgment" when drinking.

Johnston says he had "been too dumb" to use protection while dating Bristol but knew having a baby was "what she wanted".

Bristol Palin, who took part in ABC's TV dance competition Dancing With the Stars, became pregnant at age 17 and had their baby at 18.

Johnston says when Sarah Palin first learned of the teen pregnancy she laughed, thinking it was a joke. It was her husband, Todd Palin, who really showed his anger, raising his voice and telling him he needed to quit school and get a job.

Johnston claims Sarah Palin, the former Republican vice presidential candidate, also had an idea to adopt Bristol's baby to "avoid a scandal" but the young couple wouldn't allow it. Their son, Tripp, was born in December 2008.