Kiernan Shipka loves a good mirror selfie: see example A, example B, example C, and example D. And with her super cute style and makeup skills, I'm beyond obsessed with seeing her latest looks. In a new mirror selfie post on Instagram, the Mad Men actress, 22, wore a lacy sheer corset that she styled with chunky gold chains that showed off her strong arms and killer core.

"Twosday," she captioned the pic.

Naturally, all her A-list pals were digging it: Actor Lukas Gage commented, "Two is my favorite number bb." And model Nyome Nicholas wrote, "Erm. Honey! You better 😍." While actress Margaux Brooke commented, "Yessss 🔥🔥🔥."

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A post shared by Kiernan Shipka (@kiernanshipka)

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Kiernan Shipka Took A New IG Mirror Selfie And She's Looking Next-Level Fit In A Sheer Corset

But how exactly does the Chilling Adventures of Sabrina star stay in such killer shape? For starters, she works out with celebrity trainer Harley Pasternak (who also lists Ariana Grande and Megan Fox as clients). He shared two super impressive videos of Kiernan doing a Nordic hamstring curl. The first was in February 2021, with Pasternak writing, "In over 28 years of training people, I have never seen a person do Nordic curls as well as @kiernanshipka."

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A post shared by Harley Pasternak MSc (@harleypasternak)

And the second was in April 2021, which also shows Kiernan doing some dumbbell stiff leg deadlifts using two 45-pound weights. "The Queen of lean and mean hamstrings, @kiernanshipka absolutely MASTERING the Nordic curl and the dumbbell stiff leg deadlifts," Pasternak captioned his post. "There are two ways of properly trained in your hamstrings, hip extension and knee flexion. The Nordic curl is about as intense as you can get for eccentric knee flexion, and the deadlift is all about hip extension. Both of these important movements strengthen the back of the lower body."

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A post shared by Harley Pasternak MSc (@harleypasternak)

She also shared with Byrdie that she is a fan of getting her cardio in: "Getting some good movement is really important to clear my brain when I can. I love yoga; I love going on walks. If I’m feeling fun and wild, maybe a class."

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As for her diet, Kiernan shared with Byrdie that she starts her mornings with a mushroom drink. "The drink I make myself in the morning is pretty, too. It’s a latte that’s got Ashwagandha and Cordyceps and all sorts of powders and superpower-y things. I’m just getting into this stuff,"she shared.

She also likes to eat lots of veggies and meat: "I cook vegetables and meat, and that’s pretty much where it ends. I’m so into vegetables," she shared. And her faves are cauliflower and celery. "Top-favorite vegetable is cauliflower, for sure. And have you ever done roasted celery? It’ll change how you look at celery. Because right now you look at it like ants on a log, and that only goes so far. But if you toss it with some good-quality oil, salt, pepper, even get some oregano and thyme up in there, and then roast it at 400º for like 45 minutes, you’re gonna love celery all of a sudden."

BRB, going to make roasted celery.