The two actresses took part in one of the activities of the Siargao Environmental Awareness (SEA) Movement, a non-government organization. Andi and her daughter, Ellie Eigenmann, have been volunteers for the group for a while now, while it looks like Nadine joined recently.
In an IG Story, Andi shared one of the group's posts, which feature her and Nadine reading aloud to children storybooks about protecting the seas.
It appears that Nadine's rumored new boyfriend, Christophe Bariou, also volunteered as he was with her in one of the group's meetings.
In a previous IG Story, Andi also praised Nadine for volunteering and for promoting the group's advocacy.
"Glad to have this island gain someone of great influence, taking her time to support and advocate for such an important cause," wrote Andi.
This isn't the first time that Nadine has volunteered for an environmental group. In February 2020, she and other celebs took part in a coastal cleanup at a marine sanctuary in Manila.