Allison Janney won the Oscar for Best Supporting Actress for the figure skating biopic "I, Tonya".
LOS ANGELES - Allison Janney on Sunday took home the best supporting actress Oscar for her turn as the cold, sardonic mother of disgraced figure skater Tonya Harding in "I, Tonya" -- capping a sparkling awards season which saw her win all of the major prizes.
The statuesque 58-year-old Janney, the overwhelming favourite in the category, bested another actress playing a stern mother, Laurie Metcalf in "Lady Bird," as well as Octavia Spencer for "The Shape of Water."
"My fellow nominees, you represent everything that is good and right and human about this profession," she said.
Janney had already bagged the Screen Actors Guild Award, a Bafta and her first trophy in January at the Golden Globes, where she said the movie told "a story about class in America, the disenfranchised."
Harding, who became notorious after her ex-husband and bodyguard hired someone to attack her skating rival Nancy Kerrigan, has appeared with the cast during the awards season.
Authorities later found she was aware of the plan, and she was banned from the sport for life.
Janney has said the film is about "a woman who was not embraced for her individuality, the truth and the perception of truth in the media and the truths we all tell ourselves when we wake up in bed every morning and go out and live our lives."