Sienna Miller hit the London Eye to mark World AIDS Day in the UK and other celebrities joined in as well.
Along with the Alicia Keys crew of many and Bono and The Edge in Australia, Kelly Osbourne helped mark World AIDS Day at the MAC AIDS Fund at Project Angel Food in LA, and Elton John guest-edited The Independent newspaper in England.
The Killers have also created a Christmas song for (RED) on World AIDS Day.
2010 World AIDS Day was held on 1 December.