Katharine McPhee, 37, poses in a swimsuit from 40-year-old stepdaughter Sara Foster’s collection

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Katharine McPhee, 37, poses in a swimsuit from 40-year-old stepdaughter Sara Foster’s collection … five weeks after welcoming son Rennie

She gave birth to her first child five weeks ago.

And Katharine McPhee is already showing off her swimsuit body on her Instagram.

On Thursday, the 37-year-old posed for a mirror selfie wearing a swimsuit from her stepdaughter Sara Foster’s swimsuit collection.

I love it: Katharine McPhee, 37, who gave birth to her first child five weeks ago, posed for a mirror selfie with a one-piece from her stepdaughter Sara Foster's swimsuit collection

I love it: Katharine McPhee, 37, who gave birth to her first child five weeks ago, posed for a mirror selfie with a one-piece from her stepdaughter Sara Foster’s swimsuit collection

“The best piece I’ve ever tried,” Katharine wrote of the high-cut swimsuit.

“Usually it’s cut too low and the torso isn’t long enough,” she explained. Straps are adjustable. So comfortable! ‘

‘You’re nailing it @sarafoster,’ she added.

Sara is one of five grown children that McPhee’s husband David Foster has from his previous relationships.

Dad: Sara, 40, is one of five grown children that McPhee's husband David Foster has from his previous relationships.  He is pictured with Sara in October 2019

Dad: Sara, 40, is one of five grown children that McPhee's husband David Foster has from his previous relationships.  He is pictured with Sara in October 2019

Dad: Sara, 40, is one of five grown children that McPhee’s husband David Foster has from his previous relationships. He is pictured with Sara in October 2019

Couple: Singer and actress Katharine married David, 71, in 2019, and they welcomed their son Rennie on February 24 (pictured together in 2019)

Couple: Singer and actress Katharine married David, 71, in 2019, and they welcomed their son Rennie on February 24 (pictured together in 2019)

Couple: Singer and actress Katharine married David, 71, in 2019, and they welcomed their son Rennie on February 24 (pictured together in 2019)

The prolific music producer, 71, shares Sara, 40, and her sisters Erin, 38, and Jordan, 34, with his second ex-wife Rebecca Dyer, whom he was married to from 1982 to 1986.

His other children are Allison Jones Foster, 50, who was born when he was 20 and was not put up for adoption until 30 years later, and Amy Skylark, 47, from his first marriage to BJ Cook.

David and singer and actress Katharine got married in 2019 and welcomed their son Rennie on February 24.

Earlier this week, Katharine had proudly showcased her post-baby body in a brown one-shoulder bikini and told her social media followers that she ‘loves’ her new curves.

Loving her curves: Earlier this week, Katharine had her post-baby body showcased as she posed in a brown one-shouldered bikini for a mirror selfie in her bathroom

Loving her curves: Earlier this week, Katharine had her post-baby body showcased as she posed in a brown one-shouldered bikini for a mirror selfie in her bathroom

Loving her curves: Earlier this week, Katharine had her post-baby body showcased as she posed in a brown one-shouldered bikini for a mirror selfie in her bathroom

Happy: The American Idol alum told People in March that she didn't feel any pressure after her pregnancy to 'bounce back' or 'fit in her jeans'

Happy: The American Idol alum told People in March that she didn't feel any pressure after her pregnancy to 'bounce back' or 'fit in her jeans'

Happy: The American Idol alum told People in March that she didn’t feel any pressure after her pregnancy to ‘bounce back’ or ‘fit in her jeans’

The photos come after Katharine urged People in March that she didn’t feel any pressure after her pregnancy to “ bounce back ” or “ fit in her jeans. ”

“I am so grateful and happy to have had a healthy baby and felt very good emotionally and physically,” she told the outlet.

‘I’m so glad I don’t have such a crazy pressure to fit into any pair of jeans in my closet. I don’t even think about it now! ‘

The new mom added that it’s also ‘nice to take a break’ from exercise.

She mused, “In my day-to-day life, I would have an event or exercise and it’s just really nice to take a break and be happy where I am.”

Relaxed: Katharine urged People in March that she didn’t feel any pressure after her pregnancy to “ bounce back ” or “ fit in her jeans. ” “I have been so grateful and happy to have a healthy baby and felt very good emotionally and physically,” she told the outlet.

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