Appearing on “Access,” the 36-year-old actress spoke about Foster’s relationship with the Duke of Sussex, 35, who is currently residing in Tyler Perry’s $18 million Beverly Hills mansion with wife Meghan Markle and their 1-year-old son Archie.

“My husband has a really, really beautiful relationship with Harry,” McPhee said. “They’re so cute, they’re like father and son. We just stay in touch with them.”

In January, it was reported Foster, 70, helped set up Harry and Meghan’s access to a multi-million dollar Canadian compound in the wake of Megxit.

McPhee said she had “very little to do” with the arrangement.

“David’s the resource guy, he knows all the places. He loves to help people so we just hope they end up somewhere where they feel like they can really just settle down,” she said.

Although McPhee and Foster crossed paths with the Sussexes at a previous charity event in London, McPhee’s ties to Meghan, 38, date back to her childhood.

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A post shared by Katharine McPhee Foster (@katharinefoster) on Jan 31, 2019 at 10:03am PST

“She went to a school called Immaculate Heart, as did I,” McPhee said of the Los Angeles institution. “She went there for middle school and high school, and I went there just for middle school. My sister was in her class, my sister was in middle school with her, and I was in middle school when she was in high school, so I did a couple shows with her.”

Last year, McPhee posted a throwback snap of herself and Meghan on Instagram, writing: “Meghan and I did musicals together as kids. She grew up to be the Duchess of Sussex and I grew up to star on the West End, so same life if you ask me. #TBT.”

In addition to Foster and McPhee, the Sussexes — who celebrated their second wedding anniversary Tuesday — also count Adele as an LA pal.