Brad Pitt is to be reunited on screen with former lover Gwyneth Paltrow.

The couple - who were together for three years and were engaged to be married - are to star in 'Dirty Tricks' about the life of former American president Richard Nixon.

The film - which also stars Sharon Stone, Meryl Streep, Jim Broadbent, Annette Bening, and Jill Clayburgh - will cover the Watergate scandal during which Martha Mitchell, played by Streep, blew the whistle on her husband - Nixon chief of staff John Mitchell.

Gwyneth will play Maureen Dean, the wife of John Dean who, unlike Mitchell, stood by her man as the Nixon team went down in scandal.

It is not yet known what Brad's part will be.

The pair were last seen on screen together in homicide thriller 'Se7en' in which they played husband and wife.

Gwyneth is now married to Coldplay singer Chris Martin and has two children, Apple and Moses, with him. Brad is in a relationship with Hollywood beauty Angelina Jolie and is joint legal guardian of her two adopted children, Maddox and Zahara, and father to her daughter Shiloh Nouvel.

Brad and Gwyneth split in 1997 but she later said in an interview with Barbara Walters that she regretted breaking up with him.

She said she wished him well and couldn't believe he went out with her when she was "such a mess."