Brad Pitt and Gwyneth Paltrow - who were once engaged - are to star opposite each other in new movie "Dirty Tricks."

The film about the life of American president Richard Nixon - who resigned from office before he was impeached - will cover the time of the Watergate scandal which lead to his downfall.

"Dirty Tricks" also stars Sharon Stone, Meryl Streep, and Annette Bening.

Gwyneth will play Maureen Dean, the wife of John Dean who, unlike Mitchell, stood by her man as the Nixon coterie collapsed.

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

Brad Pitt and Gwyneth Paltrow were last seen onscreen together in dark thriller "Se7en" in which they played husband and wife.

Brad and Gwyneth split in 1997 but she later confessed she regretted breaking up with him.

Gwyneth is now married to Coldplay singer Chris Martin with whom she has two children, Apple and Moses. 

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