Michael Jackson's children (L-R) Prince, Blanket, Paris and singer Justin Bieber pose for photographs at a ceremony where Jackson is immortalized with hand and foot imprints in cement in the courtyard of Hollywood's Grauman's Chinese Theatre in Los Angeles on January 26, 2012.[Photo/Agencies]

Michael Jackson's daughter Paris and singer Justin Bieber pose at a ceremony where Jackson is immortalized with hand and foot imprints in cement in the courtyard of Hollywood's Grauman's Chinese Theatre in Los Angeles on January 26, 2012.[Photo/Agencies]