OSLO, NORWAY - DECEMBER 11: Actress Scarlett Johansson arrives for a press conference for the Nobel Peace Prize Concert 2008 at the Radisson SAS Plaze hotel on December 11, 2008 in Oslo, Norway. The Norwegian Nobel Committee yesterday awarded the Nobel Peace Prize for 2008 to Martti Ahtisaari for his important efforts to resolve international conflicts. Actors Michael Caine and Scarlett Johansson are due to host the gala event tonight which features performances from Diana Ross, operatic quartet Il Divo and Swedish singer-songwriter Robyn.

OSLO, NORWAY - DECEMBER 11: Actress Scarlett Johansson arrives for a press conference for the Nobel Peace Prize Concert 2008 at the Radisson SAS Plaze hotel on December 11, 2008 in Oslo, Norway. The Norwegian Nobel Committee yesterday awarded the Nobel Peace Prize for 2008 to Martti Ahtisaari for his important efforts to resolve international conflicts. Actors Michael Caine and Scarlett Johansson are due to host the gala event tonight which features performances from Diana Ross, operatic quartet Il Divo and Swedish singer-songwriter Robyn.

U.S. entertainer Diana Ross arrives with her two sons, Evan, left and Ross Naess, for a gala dinner in honour of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand hotel in Oslo, Wednesday, Dec. 10, 2008.

British actor Michael Caine, right, and his wife Shakira Baksh, left, arrive for a gala dinner in honor of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand hotel in Oslo, Wednesday, Dec. 10, 2008.

British actor Michael Caine, right, and his wife Shakira Baksh, left, arrive for a gala dinner in honor of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand hotel in Oslo, Wednesday, Dec. 10, 2008.

U.S. actress Scarlett Johansson arrives for a gala dinner in honor of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand Hotel in Oslo, Wednesday, Dec. 10, 2008.

U.S. actress Scarlett Johansson arrives for a gala dinner in honor of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand Hotel in Oslo, Wednesday, Dec. 10, 2008.

U.S. actress Scarlett Johansson arrives for a gala dinner in honor of Nobel Peace Prize laureate Martti Ahtisaari, former President of Finland, at the Grand Hotel in Oslo, Wednesday, Dec. 10, 2008.

Norwegian Crown Princess Mette-Marit (L) and Crown Prince Haakon (R) arrive for the Nobel peace prize awards ceremony at the Oslo City Hall on December 10, 2008. As he received the 2008 Nobel peace prize, former Finnish President and veteran mediator Martti Ahtisaari insisted that all conflicts could be resolved and urged US President-elect Barack Obama to strive to bring peace to the Middle East.

Nobel peace prize laureate Martti Ahtisaari (L) arrives with the Norwegian Nobel Peace Prize Committee for an awards ceremony at the Oslo City Hall on December 10, 2008. As he received the 2008 Nobel peace prize, the former Finnish President and veteran mediator Ahtisaari insisted that all conflicts could be resolved and urged US President-elect Barack Obama to strive to bring peace to the Middle East.