Celine Dion, Lady Gaga & stars perform for coronavirus health-care workers

"One World: Together at Home" leaned on scores of A-list celebrities to help spread some cheer during a time when much of the world is shut down by the coronavirus pandemic. You can click here to watch the whole show.

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Saturday's broadcast began with a six-hour livestream on YouTube, Facebook and Twitter, then headed to prime time on ABC, CBS and NBC for two hours. Stars who appeared on the broadcast TV portion of the event included Billie Eilish, Jennifer Lopez, Paul McCartney, the Rolling Stones, Oprah Winfrey and Stevie Wonder.

Music legends Lady Gaga, Celine Dion, John Legend and others closed the two-hour broadcast with a powerful collaboration.

Kesha, Matthew McConaughey and Heidi Klum were among those making appearances in the early hours of the livestream. All took time to thank health professionals who have been working relentlessly to treat Americans with COVID-19.

"If you see a health care worker, you're gonna want to give them a high-five, but don't because we don't want them to get contaminated," CBS late-night host Stephen Colbert cautioned at one point.