Justin Bieber, Cameron Diaz Sign Up for CNN Telethon for Gulf Oil Spill

Justin Bieber and Cameron Diaz are among the celebrities set to appear on a CNN telethon to benefit victims of the Gulf of Mexico oil spill, the network announced on Friday.

Disaster in the Gulf: How Can You Help will air live Monday at 8 p.m./ET (5 p.m./PT) as a special two-hour edition of Larry King Live.

President Obama outlines plan for America's "worst environmental disaster"

Guests, including Ted Danson, Alyssa Milano, Ian Somerhalder, Jenny McCarthy, Robert Redford, and Sting, will visit with King on set and via satellite, as well as help out with the program's telephone banks.

All proceeds from the telethon will go to the United Way, National Wildlife Federation and The Nature Conservancy.