Oscar-winner Ariana DeBose is mourning the loss of her mother, Gina Michelle DeBose, who has died at age 57 after battling Stage 3 ovarian cancer.

The “West Side Story” actor and Broadway star announced her mother’s death Tuesday on Instagram, sharing photos of the two of them over the years — from the younger DeBose’s childhood to her historic win at the Academy Awards in 2022.

“I couldn’t be more proud of her and how she fought this insidious disease over the past 3 years,” DeBose wrote.

Ariana DeBose, 34, said in her tribute that her mother was her “favorite person, my biggest fan and toughest critic. My best friend.” The “Love Hurts” actor said her mother “fought like hell” to support her daughter’s ambitions, adding that her accolades — which include BAFTA, Critics’ Choice and Golden Globe awards — belong equally to her mother.

The actor said her mother was a longtime public school teacher who devoted her life to educating young people. She was “the greatest advocate” for arts education, she said, adding that the death of the elder DeBose would deeply impact her mother’s community: “She was a force of epic proportion.”

Actors including “Abbott Elementary” star Quinta Brunson, “Insecure” alumna Yvonne Orji, former “Dancing With the Stars” pro Julianne Hough and celebrity fitness trainer Amanda Kloots rallied around DeBose in the comments section as she broke the news. In addition to paying tribute to her mother, DeBose highlighted several charities where supporters could donate in her mother’s honor.

“My greatest and most proud achievement will always be to have made her proud,” DeBose wrote. “I love you mommy. Now travel amongst the seas, the winds and the angels as I know you always loved to do.”