(Cover) - EN Showbiz - Sienna Miller will play a married woman caught in a love triangle in a new theatre production.

The British actress has agreed to make a return to Londons West End theatre district to star in Flare Path, which was written by Terence Rattigan. She will play former actress Patricia Graham who is married to a pilot but still has feelings for an old flame. Flare Path is set during World War II and Sienna cant wait to work with director Trevor Nunn.

[The dialogue is] Stiff upper lip - and that stiff upper lip hides their true feelings, Sienna told British newspaper The Daily Mail. Once were in the rehearsal room theres no one like Trevor to tell a story like this, and to uncover the subtext.

Sienna has known Trevor for years after she impressed him with her London theatre debut in As You Like It.

The 29-year-old actress is looking forward to getting her teeth into a challenging role, admitting she hasnt felt inspired by many scripts lately. Sienna has struggled to deal with living in the public spotlight and her romantic relationships have been the source of much speculation. She is currently dating her former fianc Jude Law, but wants people to focus on her acting talents not her love life.

Its harder these days to find things that are really meaningful. It has definitely been my choice that I havent been working a lot recently, she said, before going on to address rumours about her personal life. I didnt know actors were supposed to be perfect people.

Flare Path is expected to open at the Theatre Royal, Haymarket, in March. Rehearsals are scheduled to begin at the end of this month.

After Sienna has finished her run in the show she is hoping to appear in a movie with French-Algerian director Rachid Bouchareb and may also star in another theatre production later this year. (C) Cover Media