Fallen pop princess Britney Spears confesses in a candid documentary that will air later this month on MTV that she is still paying the price for her erstwhile public meltdown and has come to feel “enough is enough.”

It has been a difficult two years for Britney Spears, who became a teenage pop phenomenon in the late 1990s and added a new chapter to music history, only to spiral downwards after her failed marriage to Kevin Federline.

She turns 27 on December 2. Nowadays, she is less associated with her sex-symbol image and more with that of a mother to two toddlers, who are in the sole custody of her former husband, and of a troubled star who will remain under the conservatorship of her father for an undetermined period of time.

She has cleaned up her act. No more of those chaotic public outings, when a throng of paparazzi would follow her around and closely chronicle her flimsy outfits and dubious actions such as hitting a pap’s car with an umbrella or stealing a lighter from a gas station.

Since being placed under the conservatorship of her father and a lawyer in February, Britney Spears has taken on a more sober demeanor. While her mothering skills were questioned and she ultimately lost custody of Sean Preston, 3, and Jayden James, 2, to Federline, she does have visitation rights and spends time with her boys. Last week, she took her sons out of California for a family visit in her native Louisiana for the first time since losing custody in July.

While her personal life has taken a better turn, so has her professional one. Britney Spears seems bent to revive her career. December 2 marks not only her 27th anniversary but also the release of a new album titled “Circus,” via Jive Records.

A single has already been released, “Womanizer,” accompanied by a video which shows Britney Spears as focused as in the old days and just as much of a perfectionist – good choreography, tasteful costumes and the athletic, sinuous physique she first presented to her fans.

This album will benefit from another introduction as well, as Spears bares her heart in the 90-minute documentary “Britney: For The Record,” which airs on Nov. 30 in the US, via MTV, and on Dec. 1 in the UK, via Sky1.

Britney Spears confesses her current life is much like jail, as she feels restrained. She compares it with Bill Murray’s film “Groundhog Day,” saying when you got o jail, you know you will eventually get out, but for her, “it’s never ending.”

“I’m having to pay for it for a really long time,” the singer continues, adding that she feels she has learned her lesson and “enough is enough.”

Britney Spears’ explanation for the documentary’s creation is that she wanted to have the opportunity to show people what her life really is like and try to change some of the misconceptions.