More than 65 Hollywood A-listers have signed on for NBC’s Red Nose Day special, a live three-hour charity event to aid children living in poverty throughout the world. It will air live from 8-11 PM ET on Thursday May 21 ,with appearances by Julia Roberts, Will Ferrell, Jennifer Aniston, Reese Witherspoon, Jodie Foster, among others. The special also will feature comedy, musical performances and videos produced by Funny or Die.

Several media outlets, including Deadline and our sister pub TV Line, donated media space to help promote the live three-hour event. National radio time also was donated, along with advertising space in theaters and subways, on Jumbotron displays and more. Outfront Media led the charge, donating 3D billboards sporting giant red noses in top markets across the country, along with space on buses, in subways, on street furniture and via digital bulletins and posters.

Other media partners who donated space include Conde Nast, iHeartMedia, Time Inc., Amazon, AMI, AOL, Bon Appétit, Closer Weekly, Details Magazine, DirecTV, Dish, GQ, GumGum, The Hollywood Reporter, In Touch Weekly, Life & Style Weekly, National CineMedia, The New Yorker, Opera Mediaworks and Pandora, along with Rolling Stone, Rovi, Specific Media, Spotify, Tremor Video, TubeMogul, TV Guide, TV Guide Magazine, Videology and Yume.

Stars who also will appear in the special include Julianne Moore, Jack Black, Coldplay, Neil Patrick Harris, John Krasinski, Emily Blunt, Michelle Rodriguez and Gwyneth Paltrow, along with John Legend and The Voice coaches Adam Levine, Blake Shelton, Christina Aguilera and Pharrell Williams.

The benefit event will help 12 charity organizations lift children and young people out of poverty, in the U.S. and throughout the world. The charity partners are Boys & Girls Clubs of America; charity: water; Children’s Health Fund; Feeding America; Gavi, The Vaccine Alliance; the Global Fund; LIFT; National Council of La Raza; National Urban League; Oxfam America; Save the Children and United Way.