Dierks Bentley is in Oslo, Norway, to perform Thursday (Dec. 11) at the 15th annual Nobel Peace Prize concert. Diana Ross will headline the concert that also features Jason Mraz, Swedish singer-songwriter Robyn and the multi-national operatic group, Il Divo. Actress Scarlett Johansson and actor Michael Caine will host the event. This year's Nobel Peace Prize recipient is Martti Ahtisaari, the former president of Finland, for what the committee calls "his important efforts, on several continents and over more than three decades, to resolve international conflicts." View photos of Dierks Bentley at the concert rehearsals.