Josh Hartnett is furious with girlfriend Scarlett Johansson for partying with That '70s Show star Wilmer Valderrama. The Lucky Number Slevin actor was reportedly so worried that he kept calling the Lost In Translation star to check up on her.

A source told New York Daily News newspaper: "Wilmer was out in the Hamptons for a party and arranged for a helicopter for Scarlett to come out, too. It was just to hang out, but Josh was not psyched about it.

The source added: "Finally Scarlett just handed her phone to Wilmer and said, 'Talk to Josh. Tell him we're friends'."

Valderrama - whose ex-girlfriends include Lindsay Lohan, Mandy Moore and Ashlee Simpson - was hosting a lavish party in the exclusive New York neighborhood at trendy venue Star Room. The partygoers then moved onto hip nightspot Boutique for a friend's birthday celebration.