After sweeping awards season for her role playing a kidnapped mother in “Room,” Brie Larson won the Academy Award for best actress in a leading role Sunday. She was presented the honor at the Dolby Theatre in Hollywood, California, during the 88th annual ceremony.

Larson was up against Cate Blanchett for “Carol,” Jennifer Lawrence for “Joy,” Charlotte Rampling for “45 Years” and Saoirse Ronan for “Brooklyn.”

After hugging her “Room” co-star and onscreen son Jacob Tremblay, Larson thanked the 9-year old during her acceptance speech, calling him “my partner through this in every way possible.” Larson also gave a special thanks to her fans.

GettyImages-512946334 Brie Larson accepts her award for best actress at the 88th Oscars on Sunday in Hollywood, California. Photo: Getty Images

“Thank you to everyone who participated in 'Room,' ” she said. “Thank you to all of you who you saw it. Thank you to the fans. Thank you to the moviegoers. Thank you for going to the theaters and seeing our films. I appreciate it.”

This was he the first Oscar win, and first nomination, for Larson, 26. Earlier this year she won for best performance by an actress in a motion picture — drama at the Golden Globes, best leading actress at the BAFTA Awards and outstanding performance by a female actor at the SAG Awards. 

“Room” was also up for best picture. It lost the award for adapted screenplay to "The Big Short" and best director to "The Revenant."

GettyImages-512921316 "Room" star Brie Larson poses outside the 88th Annual Academy Awards on Feb. 28, 2016, in Hollywood, California. Photo: Getty Images

The 88th annual Academy Awards show airs Sunday at 8:30 p.m. EST on ABC. Find out how to live stream the ceremony HERE and check out the nominations refresher HERE.