What would you do to make your butt look good in a photo? For celebrities and social media influencers, it’s about contorting the body for the best rear view.

The most popular booty-popping position involves tilting the pelvis and arching the back, then swiveling the head to the side. Bootylicious models such as Hailey Bieber and Izabel Goulart have recently posed on the red carpet this way to highlight their pert posteriors in gowns with plunging backs.

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“I’ll stand up straight and spread my legs a little bit to make myself look a little bit wider than if my feet were closer together,” says fitness influencer Daisy Keech, who last month enlisted a plastic surgeon to certify her backside as “real” to her 1.1 million Insta’ followers.

“Then I’ll … arch my back a little bit, and I’ll kind of puff out my chest. I breathe out, and my stomach cinches in as I pose.”

The 19-year-old influencer from Los Angeles tells The Post that “a lot goes into” properly accentuating her most famous asset, which she has dubbed the “Keech Peach.”

One of her other go-to tricks involves bending the leg that’s closest to the camera while “standing supertall” on the other foot. “If you arch your back a little bit and lean the shoulder closest to the camera forward,” says Keech, “it will make your waist look smaller and your butt look bigger.”

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But while an over-arched spine may look good on the ’Gram, it’s not the greatest for your posture, say experts. With a neutral pelvis, the hip points and pubic bone align.

By contrast, the swayback position and other similar moves create an anterior pelvic tilt, “[which is] placing a lot of strain on the pelvis,” says chiropractor Marshella Thomas of Midtown’s NYC Chiropractic Solutions.

Some people do actually suffer from an anterior pelvic tilt, an issue Thomas says she would treat in her office using “strengthening and stretching positions and spinal adjustment.”

Still, posing like this for short periods of time is probably OK.

“Is it going to cause permanent damage? No,” she says. “It just causes strain on muscles and ligaments.”

To stay safe while snapping a belfie (a buttocks selfie), it’s important to properly limber up the body first.

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“Warming up before putting yourself in a strained position would really help reduce the risk of ending up with an injury,” says Erica Cole of Manhattan Physical Therapy.

“Trying to make sure you have good flexibility in your hip flexors, your hamstrings, your piriformis . . . Pilates is a really great way to make sure that your core stays stable if you’re going to be doing these sorts of extreme poses.”

Keech admits that pose prep is a key part of her fitness routine. “It’s so important to stretch your back and your legs,” she says. “I do stretches like ‘cat’ and ‘cow’ and a little ‘mermaid’ pose that help a lot with flexibility — it’s like a little workout.”

- Additional reporting by Lauren Steussy

This story was originally published by the New York Post.