The pair, who will star opposite each other in the upcoming remake of the 1970s thriller Straw Dogs, were spotted kissing outside the Chateau Marmont in Hollywood last week.
"We are very good friends," Bosworth told People. "He's a wonderful, wonderful man. I adore him."
Bosworth remained coy about her relationship with Skarsgard, whom she met last year while filming in Shreveport, Louisiana.
"That's a minefield, man! I'm not stepping into that," she said. "I've learned too well from being on that road."
Alexander Skarsgard plays vampire Eric Northman in the upcoming season of True Blood. Bosworth will next appear in The Warrior's Way.