Bellingham’s Jessica Carlin was technically the winner of Mix 104.1’s private beach house concert with Ed Sheeran. But the person who benefited most from the prize was Jessica’s 14-year-old daughter, Marissa, who happens to be an aspiring singer. Marissa asked Sheeran if they could sing together during the show on Wednesday, and Sheeran responded that he’d be happy to try a duet. According to Jessica, Marissa and Ed sang “Everything Has Changed,” the hit he usually performs with Taylor Swift. “I think she’s floating,” Jessica said, of her daughter. “Honestly, this is the most incredible day ever.” Carlin told us that she was allowed to bus about 30 friends to the private show in Bourne. And it was a good day for all; Sheeran found out on Wednesday that his second full-length release, “X,” was the best-selling album of the week, according to Billboard.