Guillaume Canet and Keira Knightley in a scene from Massy Tadjedin's Last Night. (TIFF) A star-studded movie featuring Keira Knightley and telling the story of a love quadrangle will close this year's Toronto International Film Festival, the festival announced Tuesday.

Last Night is the directorial debut of Iranian-American filmmaker Massy Tadjedin, who previously wrote The Jacket and Leo.

Knightley stars with Sam Worthington as an adulterous couple tempted by new attractions in the form of Eva Mendes and French heartthrob Guillaume Canet.

On Tuesday, TIFF co-director Cameron Bailey announced two new galas and 18 more special presentations, including the addition of Danny Boyle's new film, 127 Hours, and Clint Eastwood's Hereafter.

Boyle's Slumdog Millionaire began its climb to Oscar glory in Toronto two years ago, when it won the audience choice award.

This year he returns with the story of mountain climber Aron Ralston's struggle to survive in the Utah wilderness after a fallen boulder trapped his arm. Ralston, played by James Franco, cut off his arm to escape. The film, 127 Hours, gets its world premiere in Toronto.

Eastwood's Hereafter, the story of three people trying to come to grips with death, is closing the New York Film Festival Oct. 10, but gets its world premiere in Toronto.

Joaquin Phoenix, left, and Casey Affleck are shown Oct. 27, 2008. Affleck filmed Phoenix's bizarre attempt to become a hip hop star. (Eric Risberg/Associated Press)Also on the lineup is U.S. actor Casey Affleck's directorial debut — I'm Still Here — a portrait of the tumultuous year when actor Joaquin Phoenix declared he would reinvent himself as a hip-hop star.

A series of bizarre appearances followed, including a guest spot on Late Show with David Letterman, in which the Oscar-winning actor appeared to be incomprehensible.

The incident prompted many to wonder if Phoenix's announcement was in fact a ruse to draw attention to Affleck's first movie.

Also coming is Let Me In, an English-language adaptation of Let the Right One In, the Swedish vampire film and novel that caused a sensation in 2008.

Other international offerings include:

• Sarah's Key, by Gilles Paquet Brenner of France.
• Passion, by John Turturro of Italy.
• The Poll Diaries, by Chris Krause of Germany and Estonia.

The City to City programming, focusing on movies set in a single city, is this year devoted to Istanbul. The films to be shown include Zeki Demirkubuz's Block-C, about contemporary life in dreary apartment blocks, and Emre Sahin's 40, about young people trying to build a life in Istanbul.

This year's Toronto International Film Festival runs from Sept. 9 to 19.