Katharine McPhee shared a rare photo with David Foster and their son, saying her older husband has 'never' complained about how his life changed post-baby

• Katharine McPhee Foster shared a photo of her and husband David Foster with their son, Rennie.
• McPhee Foster gave birth to Rennie in February 2021, over a decade after the couple first met in 2006.

Katharine McPhee Foster posted a photo with her "little family," as the singer said in her caption, for Father's Day, sharing a rare glimpse of her and David Foster's young son, Rennie.

"Happy Father's to the man @davidfoster who loves me like I could have only dreamed of & who made me complete in life by making me a mommy," she wrote in the post's caption. "I love our little family. I love our big family."

McPhee Foster gave birth to her and Foster's son, whose full name is Rennie David Foster, in February 2021, People reported. While Rennie is McPhee Foster's first child, he is Foster's sixth in addition to his five adult daughters. The couple, who have a 35-year age gap, were married in June 2019 in London, over a decade after they first met when McPhee was competing on "American Idol" in 2006.

McPhee Foster's post included a photo of her, Foster, and Rennie sitting at a piano along with a carousel of photos ranging from Foster performing to him holding her hand as she lay in a hospital bed.

"You have NEVER complained over how your life is slightly different now," McPhee Foster wrote in the post's caption. "Well... you only complain that you can't stay up late watching TV in bed but how can I blame you -that's your favorite thing."

A post shared by Katharine McPhee Foster (@katharinefoster)

In a February interview with People, Foster said that he was enjoying this round of fatherhood.

"It's too cliché to say 'Now I have more time,' but I do: I have more time," Foster told People. "Without any reflection on any of my other children, whom I all love equally, and equally as much as my son."