Mandy Moore, Alexandra Cousteau unite for World Water Day

Singer-actress Mandy Moore and environmentalist Alexandra Cousteau were on Capitol Hill Tuesday in honor of World Water Day March 22.

The two participated in a Congressional briefing on the effect of water, sanitation and hygiene on global health and development and then visited Upper Senate Park, where they took photos with students from Oyster Adams Elementary in D.C. and HB Woodlawn School in Arlington. The photo opportunity was the world's longest toilet queue, to draw attention to the lack of water and sanitation globally.

Cousteau, whose grandfather is famed explorer Jacques Cousteau, talked about how water sanitation effects everything from illnesses to climate change. Moore, who was wearing dark skinny jeans, a blazer and World Water Day t-shirt, talked about her trip to Sudan at the briefing.

After the photos at the toilet line, Moore was friendly and stayed briefly to sign autographs for the students.