John Carney gave a controversial interview to Britain's Independent, where he recalled working with the 31-year-old actress on the musical, claiming, "Keira's thing is to hide who you are and I don't think you can be an actor and do that."
"My experience with #keiraknightley was utterly spectacular on every level," Mark Romanek, who worked with Knightley on Never Let Me Go, objected on Twitter. "I have no clue what this guy is talking about. #arrogants**thead"
"My recollection of #keiraknightley's 'entourage' was that her mum visited the set one day for an hour or two," Romanek added, referencing Carney's claim that the star's entourage made it "hard to get any real work done."
"I agree with Mark. Keira was a joy to work w/," Lorene Scafaria, who directed her in Seeking a Friend for the End of the World, tweeted. "Present & easy & really, really good at her job. Just lovely."
Laggies helmer Lynn Shelton chimed in, saying, "Working with #KeiraKnightley was magnificent, top to bottom. She is the real deal. #Knightleylove"
In the end, Carney claimed that he didn't want to "rubbish Keira," but said, "It's hard being a film actor and it requires a certain level of honesty and self-analysis that I don't think she's ready for yet, and I certainly don't think she was ready for on that film."
In other Knightley news, the actress welcomed her first child with her husband, musician James Righton, last year. Find out her daughter's sweet name and how Knightley says motherhood has changed her life in the video below.