Entertainment Erin Foster Jokes About Working Out with Stepmom Katharine McPhee in Planking Photo with Sister Jordan
Katharine McPhee Dances with Son Rennie as She Sings On TV, Jokes It's His 'Only Screen Time'
Katharine McPhee welcomed her first baby, son Rennie David, with husband David Foster on Feb. 22 "The ONLY screen time my baby is allowed to have ????," McPhee teased in the caption of the video. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
made a cheeky remark about doing workouts with her younger stepmom .
Erin, 38, was joined by her sister Jordan Foster and the Waitress star, 37, for a sweat session on Thursday.
She then posted a photo as the three of them held a plank and joked, "You ever side planked with your 37 yr old step mom? I have."
McPhee – who is married to– became the stepmom to Erin, Jordan, , Allison Foster and Amy Foster in 2019.
Katharine McPhee Says Husband David Foster 'Wants to Hold' Their Son Rennie 'All the Time'
New mom Katharine McPhee raves over husband David Foster's fatherhood skills on the latest episode of the PEOPLE Every Day podcast with host Janine Rubenstein. "It's a growing family, and David's doing great," McPhee says. "He's always walking into a room saying, 'Where's my baby? Where's our baby? He wants to hold the baby all the time, and be around the baby.
Erin, Jordan and Sara sat down with PEOPLE in July 2020 and discussed.
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"Our biggest issue with [Katharine] is how hot she is," Erin told PEOPLE. "Her body is insane. When she comes over for family Sundays, I'm like, 'Do not get in a bikini.' My husband's always like, 'Kat, get in the pool!' And I'm like, 'Simon...' "
She also joked that all of their husbands and Jordan's son Otto "hang on the side ogling her."
Other than that, the three women said McPhee — whom David met in 2006 when he served as a mentor to her and other contestants on season 5 ofand married on June 28, 2019 — has only been a positive addition to their lives.
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"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."
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David added that he thinks McPhee, with whom he welcomed sonin February 2021, has navigated her stepmother role "really, really well."
"And so do they," the Grammy winner said of his daughters. "Because they could be horrible. It sure makes it easier for me that they get along. It's not a fleeting thing, either. It's been a few years."
The most talked-about gala dresses .
From the risqué to the eccentric to the overtly political, here are the red-carpet dresses that people just couldn’t stop talking about.