Actress/producer Christy Scott Cashman played muse and model for Melanie Fraser Hart this week, trying on a few pieces of the designer’s Fall 2013 line. Fraser Hart, a Hull native, is taking her women’s wear line Callula Lillibelle to New York Fashion Week next month. She just returned from China where she was one of 10 US designers to showcase their collections at Chengdu Couture Fashion Week. Celebs who’ve worn her work include Sofia Vergara and Kerry Washington. . . . The band Fun., whose song “We Are Young” was inescapable last summer, played a short set at Wachusett Mountain Ski Area as part of Mix 104.1’s “Mix Lounge’’ series. A few hundred fans got to see Nate Ruess, Andrew Dost, and Jack Antonoff do their thing in Wachusett’s Granite Room. . . . At 72, legendary Motown singer Smokey Robinson’s still got it, according to folks who attended his sold-out show at the Wilbur Theatre this week. Wilbur boss Bill Blumenreich was there to congratulate Robinson on his 50th anniversary in the music business.