As the Hope for Haiti Now telethon goes live across the globe, celebs are tweeting direct from the phone line booths and uploading pics from the massive fund-raising event.

Hundreds of actors, singers and entertainers have lent their time to the telethon, which was organised by George Clooney.

Russell Simmons has been uploading loads of photos, prompting Twitter head honcho Ashton Kutcher to write, "You are doing an amazing job covering the Haiti telethon@UncleRUSH."

Other celebs tweeted:

• jaredleto Sat next to Penelope Cruz and Michael Keaton, both really nice and working the phone relentlessly.
• johncmayerGiving away 6 pairs of tickets to shows on the upcoming tour RIGHT NOW. Donate at hopeforhaitinow.org or call 877-99-HAITA and then tweet #idonated to @johnmayer. I'll DM you if you win!! Keep donating!
• kirstiealley I love it when they show SURVIVAL stories!!! so beautiful...
  
• questlove The Roots and I had fun backing Shakira, Mary J, Sting&J Hud, let's not lose sight of why we are here. hopeforhaitinow.org
• lisarinna Bravo to George Clooney and the hopeforhaitinow.org telethon it is brilliant! Please let's all give! George Clooney 2014 for President! I'm not kidding.
• BusaBusssGreat job Hov, Bono, and Rihanna...#Hope for Haiti Now!!!!!
• RobertsEmma Hopeforhaitinow.org wish I could be at the telethon. On set. My heart goes out to them.
• KimKardashian Wow! Madonna! Beyonce! Sheryl Crow! All of my favorite singers. Singing for such a good cause. 877-99-Haiti or text GIVE to 50555.

To donate, visit HopeforHaitiNow.org.