• Katharine McPhee Foster is the chicest wedding guest.
• Over the weekend, the 39-year-old actress and singer posted a photo of herself on her Instagram Stories wearing a simple floor-length gown with a cutout right in the middle—accentuating her super-toned abs.
• To stay in shape, she works out with personal trainer Oscar Smith—focusing on every part of the body.

Wedding season is in full swing and even celebrities have a ton of ceremonies to hit up. In the mix: Katharine McPhee Foster in the coolest cut-out dress.

Kat casually dropped a photo in her Instagram Story of herself working the black dress and it’s a total mood. There’s the 39-year-old actress and singer casually leaning against a vintage car in the floor-length gown, which has a cut-out in front that shows off her toned abs. Katharine kept it simple, writing “wedding season” over top.

Her husband David Foster shared a photo of himself in that same car, looking all James Bond-like

So…what does Kat do to look so strong? She works with personal trainer Oscar Smith, who told Life & Style that his famous client is a “competitive athlete.” Kat “does not quit,” he added.

Those workouts cover pretty much everything: “For upper body, we would focus on a specific body part, then start off what I call ‘the Triangle,’” Smith said. Kat then runs through a slew of exercises, including jumping rope, box jumps, sprints, and stair runs. She’ll also do max reps of variations of pull-ups, chin-ups, and push-ups.

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Kat has been open about having a history of disordered eating and bulimia, but she told E! that having her son Rennie in 2021 helped her love her body. “I’m so much happier, so much more peaceful,” she said. “The extra weight that I gained while I was pregnant has just sort of fallen off naturally. I never had to torture myself to do any of those things.”

David got backlash in 2021 after posting a photo of Kat in a bikini a few months after having Rennie. “What baby,” he wrote in the caption.

But Kat later defended him in her own Instagram post, stressing that she felt good about herself after having her son. “I’ve struggled with weight my whole 20s and 30. I’ve gone up and down 10 times over,” she said. “I lost this baby weight without dieting. Zero. Diets are the worst and I’ve had zero pressure from anyone. I’ve let me body do its thing and found a great workout. That’s it. And guess what? I’ll probably gain weight again at some point too. Who cares?”

Kat McPhee Foster, everyone!

Korin Miller is a freelance writer specializing in general wellness, sexual health and relationships, and lifestyle trends, with work appearing in Men’s Health, Women’s Health, Self, Glamour, and more. She has a master’s degree from American University, lives by the beach, and hopes to own a teacup pig and taco truck one day.