Being Julia (2005)

"Being Julia" is a delicious tale of amorous folly and revenge set in the world of the London stage in the late 1930s. Based on W. Somerset Maugham's novel, it is the story of reigning diva Julia Lambert, whose success and fame grow suddenly wearisome. She falls head over heels for a young American, Tom, and begins a passionate affair. When she realises that Tom is just a young social climber whose real passion is ambitious young starlet, Avice Crichton, Julia begins to plot a delightful revenge.

Official website: http://www.sonyclassics.com/beingjulia/