Jennifer Aniston is rumoured to be writing a tell-all book about her marriage to Brad Pitt.The former 'Friends' beauty, who divorced Brad last year, allegedly kept a diary during their relationship and wants to expose the truth about their life together.According to a report in Britain's Daily Mirror newspaper, the actress also believes penning the tome would help her get back at Brad for his romance with Angelina Jolie.Earlier this month, Jennifer revealed she has no regrets about divorcing Brad.The star claimed 2005 was a "great year" - despite the break-up - and said she wouldn't change anything about the last 12 months.She said: "This was a great year for me. I wouldn't change a lick of it."It's been the best of times and the worst of times. It's been quite a year, but I wouldn't change anything or trade it in for anything. I wouldn't be sitting here and feeling how I'm feeling."

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