Rumer Willis Says Sister Tallulah’s Autism Diagnosis Was a ‘Homecoming’ [Video]

Rumer Willis is endlessly proud of her sister Tallulah Willis.

The Once Upon a Time…in Hollywood actress, 36, spoke at the Autism Speaks Los Angeles Gala on Thursday, Oct. 24, about Tallulah’s autism diagnosis. In her speech, Rumer praised Tallulah’s confidence and self-discovery.

She introduced her “extraordinary sister” Tallulah, 30, who was honored that evening for her “commitment to promoting acceptance and raising awareness about autism exemplifies the mission of Autism Speaks and reflects her deep passion for the cause,” according to a press release shared with PEOPLE.

“From the very start, she stood out — not just for her creativity, which was wild and boundless, but for the way she seemed to exist on a slightly different frequency from the rest of us,” Rumer began her speech. “While other kids were coloring inside the lines, she was busy inventing her own worlds. And honestly, most of us were lucky just to keep up.”