Jennifer Aniston has vented her spleen at Brad Pitt – by writing a frank three-page letter to her ex-husband.

Pitt phoned Aniston to wish her happy birthday last month, but the former Friends actress reacted angrily to the call, firing off a letter the following day telling the Hollywood star she "never wants to hear from him again".

Aniston is still fuming at the Fight Club star after he walked out on their marriage to get together with Angelina Jolie, who is now expecting their first child together.

But friends say she now feels better having told Brad exactly how she feels.

A source tells Star magazine, “The letter would have been therapeutic for Jen. She has found it hard to get over the split with Brad.

"Writing a letter would have been her way to express her emotions and move on with her life. She wants a clean slate - and so does her boyfriend, Vince Vaughn. It would be her way of saying goodbye once and for all."