ORLANDO Bloom snacked on Claire Danes' lovely neck during a dirty dancing session on Saturday night. The hookup happened on the dance floor at the Raisa Gorbachev Foundation party at the Althorp (Earl Spencer's) estate in Northamptonshire, England. We're told the "Lord of the Rings" hunk made his move after boogeying over to Danes during a performance by the Black Eyed Peas. "He was kissing her neck and grinding against her," reports our snitch. "He didn't seem to care who saw it." Guests included Mikhail Gorbachev, Denise Rich, Salman Rushdie and Nicky Hilton.

PG6