Justin Bartha married his girlfriend, fitness trainer Lia Smith, in a sunset ceremony in the bride's native Hawaii, People.com reported Monday. Among the guests at Saturday's service and reception at Kualoa Ranch were actress Reese Witherspoon and her husband, agent Jim Toth; actor Jesse Eisenberg; and Bartha's "Hangover" co-star Ken Jeong, the report said. The couple, who have been together more than a year, announced their engagement last May.