Well, apparently they are. In a recent interview with Access, McPhee revealed that her husband David Foster was quite close with the Prince.
“My husband has a really, really beautiful relationship with Harry," she said. "They’re so cute, they’re like father and son,” Katharine shared. “We just stay in touch with them. Meghan and I knew each other from childhood, but really, Harry and my husband are friends, and it’s really nice."
In regard to her relationship with Markle, she explained that it is definitely more low-key. "She went to a school called Immaculate Heart, as did I. She went there for middle school and high school, and I went there just for middle school,” she told them. "I did a couple shows with her and she was always put together and great. I was never really close friends with her,” she explained.