AceShowbiz - Oscar winner Ellen Burstyn will make her debut in London's West End next year when she joins Keira Knightley in "The Children's Hour". The Moliere classic, about a runaway student at an all-girls boarding school, is heading to the stage at The Comedy Theatre in January and the 77 year old has signed on to portray the grandmother of one of the girls.

"Mad Men" star Elisabeth Moss and actress Carol Kane have also been added to the cast in the Lillian Hellman production. "The Children's Hour" was previously turned into a 1961 movie of the same name starring Audrey Hepburn and Shirley MacLaine.

"Children's Hour" is a drama set in an all-girls boarding school run by two women, Karen Wright and Martha Dobie. An angry student, Mary Tilford, runs away from the school and to avoid being sent back she tells her grandmother that the two headmistresses are having a lesbian affair. The accusation proceeds to destroy the women's careers, relationships and lives.