Keira Knightley's return to the West End has drawn respectable reviews, with one critic saying the British actress has now "won her theatrical spurs".
Danny DeVito and Bend It Like Beckham director Gurinder Chadha were among the audience as the 25-year-old took her bows at London's Comedy theatre.
Knightley is appearing with US Mad Men star Elisabeth Moss in The Children's Hour, by Lillian Hellman.
The 1934 play tells of teachers accused of having an illicit lesbian affair.
Knightley received mixed reviews when she made her West End debut in 2009 in an updated version of Moliere's The Misanthrope.
Writing about that production, Charles Spencer in the Telegraph said: "She got through it with her dignity intact, but often seemed strained and nervous".
This time, however, he said the actress "displays confidence throughout before rising in the final act to dramatic heights that are shattering in their intensity".
The critic also praised Moss for "a fascinatingly conflicted performance that is as subtle as it is strong".
According to Michael Billington in the Guardian, Knightley and Moss "prove as potent a combination on stage as at the box office".
"Ian Rickson's atmospheric, slow-burning and ultimately enthralling production proves far more compelling that I expected," his three-star review continued.
Yet The Daily Mail's Quentin Letts expressed reservations, comparing Knightley to "one of those plucky amateur jockeys in the Grand National".
"Miss Knightley tries," he writes. "By God, she tries. She turns in a performance of which many a journeyman thesp would be proud.
"But is she a real leading lady? Is she a genuine stage star? Not quite."
The Children's Hour, which also features Oscar-winning actress Ellen Burstyn and veteran comedienne Carol Kane, has been filmed twice.
The second version, released as The Loudest Whisper in the UK, starred Audrey Hepburn, Shirley MacLaine and James Garner.
It was last staged in London at the National Theatre, with Dame Harriet Walter and Clare Higgins as the teachers, and Emily Watson as the pupil who accuses them.
In the latest production, that part is played by Rada-trained Bryony Hannah, singled out for praise by the critics.
"Hannah is memorably sly and horrible as the young troublemaker," writes Spencer, while Letts calls her "a fantastic find".
The Children's Hour continues at the Comedy until 30 April. Knightley can also be seen this week in the film Never Let Me Go, based on Kazuo Ishiguro's novel.