Bristol Palin is to pen a memoir.

The 20-year-old political activist - who is the daughter of controversial former Republican vice-presidential candidate Sarah Palin - will release the tome, entitled 'Not Afraid Of Life' this summer.

A statement from publisher HarperCollins said: "'Not Afraid Of Life' will offer an inside look at her life, her world and the things that matter most, including her family and the faith that keeps her centered."

Bristol - who landed a runner-up position on US TV show 'Dancing With The Stars' last year - will also document the "gruelling practices and criticisms she endured" while appearing in the series in the soon-to-be released book.

She said at the time: "It's pretty unbelievable for me to be on one of the biggest shows on MTV to one of the biggest shows on TV."

Bristol has a two-year-old son Tripp with ex-boyfriend Levi Johnson and will also be discussing the troubles of being a single teen mum in the tome.