Jessica Simpson Shares Video of Husband, Kids 'Back at Home' After Revealing 100 Lb. Weight Loss

Jessica Simpson‘s family can’t wait for her to get home!

The singer and fashion mogul, 39, jetted off to New York City for work this week — her first trip without her 6-month-old daughter Birdie Mae — but her husband Eric Johnson and two older kids (son Ace Knute, 6, and daughter Maxwell “Maxi” Drew, 7) have everything under control.

“Hey, let’s say hi to Mama,” former NFL player Johnson, 40, tells his children in a cute selfie-style home video taken while the foursome hang out in a pool. Birdie is dressed in a colorful rash-guard swimsuit and blue bucket hat as her dad holds her, while her two big siblings splash around in the background.

Ace and Maxi exuberantly greet their mom, which is followed up by Johnson telling his wife, “We love you!”

“I love you more!” the two older kids adorably yell over each other, leading Johnson to laugh before the end of the clip — which Simpson captioned, “Meanwhile, back at home 😭.”

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Simpson revealed on Instagram Tuesday that she was “emotional for many reasons” as she headed off on her first trip away from daughter Birdie, whom she and Johnson welcomed on March 19.

But she was also “so proud to feel like [herself] again,” sharing that she had lost 100 lbs. since giving birth and had previously “tipped the scales at 240.”

“Even when it felt impossible, I chose to work harder. 💚,” Simpson noted proudly, captioning a two-photo gallery in which she wore a black midi dress featuring long bell sleeves, a pleated skirt and a belted, cinched waist.

“She’s working hard and working out and eating healthy and trying to get back in her best shape and excited for what’s ahead,” a source told PEOPLE of the star, whose upcoming memoir is set to be released on Feb. 4.

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“She’s trying to get back to her healthiest place,” the insider continued. “And she just wanted to get to a place where she feels her healthiest. She’s not focused on the number, but on feeling her best self.”

The source also shared with PEOPLE that Simpson was “very committed” to the fitness process, having “set a goal and [gone] for it” after experiencing “a hard time not feeling like herself” post-baby.

“Jessica had a trainer [Harley Pasternak] and she was very committed to working out. She also did a lot of walking — walking is huge for her mentally and physically,” the insider said. “It’s always been something she does to clear her head and for the steps.”

“She ate a lot of vegetables,” the source continued. “She also discovered the vegetables she likes that can also be masked into different dishes. And she limited foods that were fried and high in calories. But she did not deny herself, and gave herself nice healthy meals. She believes in moderation and she was conscious of her goal. At certain times, she allowed herself to indulge.”