Singer turned actress Katharine McPhee is officially Katharine Foster after marrying music mogul David Foster this summer! Over the weekend, the new Mrs. Foster stepped out to support other young artists at the Vocal Star seminar, telling “Extra” about her recent nuptials in London. She doesn’t have just one favorite memory, explaining, “I can’t pick out a specific thing, there were so many wonderful memories. Just like being with friends and family in a very small setting was really special.” Katharine has changed her Instagram handle to include her new last name.