Jennifer Lopez, 51, Just Showed Off Her Toned Booty In A New Swimsuit Instagram Pic

• Jennifer Lopez, 51, showed off her seriously toned butt in a white swimsuit Instagram.
• The singer maintains an intense workout workout and healthy eating habits to stay fit.
• The key to J.Lo's booty? Sumo lunges, according to trainer David Kirsch.

While other celebrities were posting BTS photos of their Golden Globes prep on Instagram this Sunday, Jennifer Lopez casually dropped a pic of herself hanging out in a bathing suit, as one does.

"#SelfcareSunday ✨🤍✨ @jlobeauty," the actress, 51, simply captioned the casually gorgeous photo. In it, J.Lo is wearing a plunge-front white one-piece swimsuit with a belt. The sides are cut up past her belly button, and her butt looks amazing.

And, yeah, fans of the multi-hyphenate icon definitely noticed. "You have discovered the fountain of youth. When will you share it with the rest of us? 😜," one person wrote. "HOW?????????" someone else chimed in. "Treasury house of hotness and beauty ❤️❤️❤️❤️🙌🔥🔥🔥🔥🔥🔥 LOVE YOU," another wrote.

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Of course, the Marry Me star has made it super clear that she works hard to look that good, cycling through intense workouts and a strict diet to help her look all J.Lo-y.

The "In The Morning" singer's trainer Dodd Romero told O, the Oprah Magazine that J.Lo's usual core workout starts with a set of 50 hanging ab raises, 50 rope crunches, and 50 incline sit ups with a 45-pound plate. After that first set, she does 35 reps of each, and then 21. OMG.

She also works out pretty much every day, telling Us Weekly in 2015 that she "rarely skips a workout."

J.Lo eats really well, too. "Everything is fresh," trainer Tracey Anderson told People. "There’s nothing processed–just [protein powder] in a shake if we do a protein shake one day."

J.Lo also "stays away from processed foods and gets her nutrients from whole sources," Romero told US Weekly. Her go-tos: egg whites, white meat turkey, chicken breast, and grass-fed beef.

As for that booty… trainer David Kirsch, who has worked with J.Lo, told Byrdie that sumo lunges help the singer-actress get a tight and toned butt. (Sumo lunges are basically squats where you do a roundhouse-style kick to the side.) "It’s the perfect butt-shaping, hip reducing, lower half–sculpting maneuver," he said. "It targets the outer thigh and [can help] lift the butt, which seem to be two problem areas for a lot of women."

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