Blunt duets with Hilton on 'Grease' tune

James Blunt performed a duet with Paris Hilton of the Grease tune 'Summer Nights' at the weekend.

The 'You're Beautiful' singer and US socialite performed a warmly received rendition of the musical classic at a birthday party for designer Diana Jenkins in Malibu, according to a report in the New York Post.

Hilton and Blunt have been spotted together at numerous times during the year, but neither party has confirmed any sort of relationship.

Blunt reportedly left the party with German model Tatiana Patitz and not The Simple Life star.