• Katharine McPhee, 37, just showed off her killer abs on Instagram while wearing a mismatched lingerie set.
• The singer recently posted a ~spicy~ screenshot from a text to her husband on her Instagram Story.
• Katharine says running and strength training help her stay in such great shape.

Relationship goals and #fitspo all in one Instagram post? Only Katharine McPhee could pull that off. The singer-songwriter, 37, just gave her followers a sneak peek into her marriage to musician David Foster by posting a screenshot of their text messages on her Instagram Story.

In the snap, Katharine’s washboard abs are totally on display in a blue bra, black underwear, and a white shirt. “Texts with the husband @davidfoster,” she captioned the screenshot—but can we talk about her core? Her abs look killer.

“I’m an underwear model now,” she texted David. He was more than supportive: “Vava VavA-voom,” he responded. “Hot mom-I tried u a bit ago but u are obviously busy stripping!! 😂 U look amazing!!! Wow!!!”

Here’s the screenshot in question:

Plus, exhibit B of Katharine’s six-pack:

https://www.instagram.com/p/CUIhtFAPj86/

A post shared by Katharine McPhee Foster (@katharinefoster)

So, just how does Katharine stay so fit? For starters, she works out three to four times a week for an hour, per Shape. She likes to go for long runs—but her trainer, Simon Carter, throws a few extra exercises in to keep things interesting.

“We’ll run and we’ll, like, in the middle of each intersection do, 20 push-ups or 20 jump squats, and then start running again, and go for four or five miles,” Katharine explained. Sometimes, Katharine also does walking lunges uphill and downhill to break up her runs.

Her other trainer, Oscar Smith, told Life & Style that Katharine is a “competitive athlete.” He helps Katharine with her strength training, but not the kind with heavy weights. “Some days with no weights would be 15 reps of assisted pull-ups, chin-ups, reverse grip pull-ups, close grip pull-ups, wide grip pull-ups, 50 dips, then 50 decline push-ups, 50 incline push-ups, 50 regular push-ups,” he explained.

When Katharine and Smith want to focus on cardio, he helps her through a circuit that might include anything from jumping rope to sit-ups to box jumps.

The Smash actress has also been open about her struggles with bulimia in the past. While she was pregnant with son Rennie, she told Today that she often felt overstuffed in her first trimester. “It was really a transition and balance for me to figure out the food stuff,” she said.

“I think if you have issues with food it’s always something that there are phases when it comes back into your life and it haunts you and then you get a hold of it again,” Katharine added. “Feeling like there was a relapse after getting pregnant was really shocking and upsetting and concerning for me, because I was suddenly so obsessed with food, starting from this first trimester, and I had such a distortion of the way that I looked.”

But seeing a psychiatrist “made me feel so much better that I wasn’t alone in that headspace . . . by just meeting with him and him talking me through it,” Katharine said.

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