Mrs. Fujikawa certainly has a nice ring to it! Sources are buzzing that Kate Hudson and her boyfriend, Danny Fujikawa, secretly tied the knot this summer after the 40-year-old actress was spotted wearing a simple gold band on that finger while vacationing in Capri, Italy, last month. “It definitely wasn’t costume jewelry, or borrowed for that matter,” insists a source close to the couple, who were in town for the BVLGARI High Jewelry Exhibition. According to the source, Kate was also overheard referring to the 33-year-old musician as her “husband” several times in conversation at the star-studded June 13 event. While mom Goldie Hawn has never walked down the aisle with Kurt Russell, even after 36 years, daughter Kate has been married once and engaged twice before. The Almost Famous…