Lydia Hearst has vowed to donate up to $2,500 (£1,666) to a charity offering surgery to children with facial deformities.
The socialite-turned-actress has worked closely with bosses at Operation Smile, which aims to correct cleft lip and cleft pallets in youngsters.
She's now pledged to donate $1 (66 pence) for every fan who registers on her website, up to a total of $2,500.
In a post on her site, Hearst writes, "Actions speak volumes and make all the difference in the world. Working with and looking into the eyes of the doctors, volunteers, children who have been affected by facial deformities such as cleft lip and cleft pallets and their parents; I want to do everything in my power to help and show support for them in any way possible.
"Traveling (sic) to a foreign country with individuals coming together from various backgrounds from all over the globe, putting their differences behind them in place of one common goal, to help people and change their lives for the better is the goal of Operation Smile. Revolutionising and changing lives is the ultimate goal and I believe the doctors and volunteers more than succeeded in this."