You probably know Dolly Parton as a country singer and actress, but you may not be aware that she is a philanthropist and huge supporter of childhood literacy programs. In 1995, she launched Imagination Library, a literacy program that mails free books to children from the time of their birth until they enter kindergarten. Parton was inspired by her own father’s illiteracy to create the program.

Today, Imagination Library will reach the extraordinary milestone of 100 million donated books. The event will be celebrated at the Library of Congress in Washington D.C. with a ceremony and a reading by Parton. You can view a livestream on YouTube here.