The Smash actress, and her husband David Foster, who got married in June 2019, are expecting their first child together! The two first met in 2006 when he mentored her and other contestants on season 5 of American Idol.
McPhee and Foster were spotted out on Tuesday in Montecito, California, grabbing lunch together and shopping for baby buys.
The mom-to-be dressed casually in gray leggings, a black top and a baseball cap while carrying her dog in a bag.
Foster is already father to daughters Sara, 39, Erin, 38, and Jordan, 34, whom he shared with second wife Rebecca Dyer, and daughters Allison, 50, and Amy, 46, from previous relationships.
Earlier, Erin told PEOPLE that McPhee has been a positive addition to their lives and they at times jokingly refer to her as “Mommy”.
“Interestingly, the age difference has played a role in a positive way,” Erin said. “Our dad comes from a generation where women are more passive. He is also passive about his feelings. Kat has really pushed him to open up. We could get into a fight, and then Kat’s like, ‘No, you have to pick up the phone, call your daughter back.’ She’s a facilitator, which is really important. She pushes him to be more emotional and more vulnerable.”