Los Angeles, July 14 : Hollywood actor Sean Penn has received a knighthood in recognition of his work to boost relief efforts in the aftermath of a devastating earthquake in Haiti in January.

He was among 23 people, including former US president Bill Clinton and CNN reporter Anderson Cooper, knighted by Haitian President Rene Preval in Port-Au-Prince Monday, reports imdb.com.

They were presented with medals and certificates.

The "Milk" star has been a regular visitor to Haiti and a major part of the recovery effort, helping to set up relief camps for more than 1.5 million Haitians still homeless six months after the quake. (IANS)