It is a heart breaking ailment that has recently become a viral sensation.
And on Saturday, Selma Blair and Ali Larter were moved to tears when they learned more about Batten Disease at a party in Brentwood.
The 39-year-old and Selma, 42, had dressed in their garden party best for The Charlotte & Gwenyth Gray Foundation To Cure Batten Disease's Tea For Two event.
While Selma shone in a summery red floral dress, Ali showed off her fit figure in a tight off-the-shoulder nautical number.
Selma radiated with a flawless coat of light pink blush and plum pink lips.
Her thick bangs were swept over her forehead, while the remainder of the glossy mane was worn down in a straight and effortless hairdo.