The celebrated pop artist’s recent transformation has sparked widespread attention and discussions about health, fitness, and personal growth.

In the Instagram clip shared on December 10, the 30-year-old star flaunted a sultry Mrs. Claus-inspired outfit. The ensemble included a red plaid pleated skirt reminiscent of a schoolgirl style, glittering red boots, and a festive red and white bra.

Trainor added a touch of elegance with a cropped red sweater adorned with feathered cuffs and completed the festive look with a Santa hat. Her signature blonde locks fell effortlessly, complementing the dazzling holiday-inspired costume.

Accompanied by her backup dancers, the singer performed an energetic routine to her hit single “Criminal,” captioning the video, “With her elves.”

Capturing the electrifying atmosphere of the event, she posted photos of her time on stage, delighting fans with her powerhouse performances.

Instagram users expressed a mix of admiration, surprise, and curiosity about the musician’s new look. Some celebrated her hard work, while others speculated about potential weight loss aids.“What happened to her???!!!!” exclaimed one user, while another fan observed, “[Meghan’s] face looks [so] skinny!”

“Sad to see all the Celebrities waisting away on ozempic. we are loosing curves and look unhealthy [sic],” another user lamented. “Ozempic stole the bass,” one person joked, referencing her hit single “All About That Bass.”

On a more supportive note, one comment read, “Finally a celebrity who didn’t get skinny [overnight] and put in the work!!” Another joked, “Omg she’s lost so much weight, she def got no base now lol [sic].”

Speculation continued with, “[No] wonder ozempic is out of stock.” Another commenter questioned, “She looks very thin now. Ozempic??” A fan kept it simple with, “You look fantastic.”

Facebook users also shared their thoughts, with some expressing concern and others marveling at her transformation. “All of a sudden she’s lost heaps of weight and changed all her face…. looks like a different person. Sad they feel the need to do this to themselves. Looked fine before,” one user wrote, though they added a positive sentiment.

Another commenter noted, “Wow she’s unrecognizable! She changed so much.” Curious about Trainor’s fitness journey, one fan asked, “How did she get so fit[?] I really wanna know.” In contrast, a critical user remarked, “She is way too skinny.”

On TikTok, the dialogue about Trainor’s transformation brought out both admiration and humor. “Where did the bass go,” one TikTok user lamented. Another comment read, “Meg the leg muscle girl I see you drop the routine [sic].”

Offering support, a fan cheered, “She looks so good! I wanted to say what happened to the bass the first second I saw her too. go girl [sic]!!” A final uplifting note came from a user who penned, “[You] look phenomenal!!”

Trainor’s transformation journey took center stage once again as she opened up about her weight loss and fitness routine during a candid conversation on the “Today” show on December 12, 2024. Following the flurry of reactions to her recent appearance at the iHeartRadio Jingle Ball, Trainor’s insights into her commitment to health and fitness provided fans with a deeper understanding of her remarkable changes.

During her interview with Hoda Kotb and Jenna Bush Hager, the “Me Too” singer revealed that her journey toward reshaping her body began with a desire to feel stronger, especially as a mother. Kotb complimented her appearance, saying, “Can I also say that you’re in great shape?” Hager chimed in with enthusiasm, “You look gorg!”

In response, Trainor humorously remarked, “Oh my God, have you seen me in the gym?” This opened the door for Kotb to ask whether her transformation was an intentional effort to prioritize health. “First of all, we love you inside and out throughout all, but this is like a new phase for you. Is this something where you intentionally said, ‘You know what, I want to get healthy?'” Kotb asked.

Trainor shared that her primary motivation stems from her children. “I mean, look at those kids. I’ve got to lift them up and chase them. I’m exhausted,” she explained. Her children often visit her during training sessions, adding an extra layer of inspiration to her fitness routine. “They come and visit me every single workout. They come at the end,” she said with a smile.

While she’s not obsessive about exercise, Trainor revealed her dedication to lifting weights three times a week. “I’m not crazy,” she said, emphasizing that weightlifting has been a game-changer for her.

“I didn’t know lifting weights would change my life so much. I was, like, dying, trying to run on the treadmill, and it made me swollen,” she admitted. Instead, she discovered that weightlifting gave her the strength and energy she needed. “I just saw I can be stronger, you know?” she explained.

The conversation also highlighted the practicality of her workouts. Kotb remarked on the benefits of lifting weights, saying, “Weights give you more energy later. I think when you run, you get more adrenaline, but when you lift weights, you’re like, wow.” Trainor, with her characteristic humor, quipped, “And you’re dead the whole day,” prompting laughter from her hosts.

Hager suggested incorporating children into workouts, which Trainor embraced with her signature wit. “Now, I lift them up like a dumbbell,” she joked, adding, “I’m like, ‘Okay, use your legs!'”

Trainor’s openness about her journey extends beyond her weight loss and fitness routine, delving into the challenges she faced with cosmetic treatments.

While on “Today,” the pop star discussed how a cosmetic procedure known as a “lip flip” initially left her unable to smile. “The movement is coming back,” she said, explaining that she had initially struggled to smile after undergoing the treatment. “I got what’s called a ‘lip flip.’ It was my first ever.”

Encouraged by others to try the procedure, Trainor recalled, “And everyone’s like, ‘You’re going to love it, your little lips,’ and I didn’t love it because I couldn’t smile.” She demonstrated the location of the injection in the middle of her lips and described the discomfort. “It was the most painful thing, and I was like, ‘This is going to look great,'” she said, mimicking a half smile.

Trainor also revealed that she received Botox in her jaw to address clenching issues but said the combination of procedures left her unable to smile. “I think the mixture of the two [caused] me not to smile. … Nobody warned me.”

On her “Workin’ On It with Meghan Trainor, Ryan Trainor & Daryl Sabara” podcast in November 2024, the “Lips Are Movin'” singer went into further detail about her cosmetic experiences, admitting she had gone “too far” with Botox.

“Someone convinced me with my little lips that if you did a lip flip, you put filler right above your upper lip, that you could have a beautiful flip on your upper lip. And I could have one for the first time in my whole 30 years of living. It was not true,” she confessed.

Reflecting on her broader Botox history, Trainor confessed, “I’ve had Botox, like, a handful of times … just my forehead.” She shared the aftermath of her decisions, saying, “I cannot smile anymore. Everywhere I go, I cannot smile. My face hurts to smile, to even try.”

Despite the challenges, Trainor found a valuable lesson in the experience. “It taught me my smile does light up a room, and when it’s not there, it’s a dim light. I feel like I’m not happy because I can’t smile,” she said.

Still, the comments she received encouraged her to continue experimenting. “I was like, ‘This is young.’ People gave me compliments saying, ‘You look rested.’ So I was like, ‘I’m going to do it again.’ I just got back from tour.” Closing her reflections, Trainor offered a simple takeaway, “Don’t try everything.”

Long before her transformation became a talking point, Trainor championed body positivity with her breakout hit, “All About That Bass.” Written in collaboration with Kevin Kadish, the 2014 global sensation topped the charts in 58 countries and became a defining anthem for self-acceptance.

Reflecting on the creation of the track, Trainor shared that she was just 19 years old when she co-wrote it. “I was a chubby kid growing up,” she said, noting how the song became a platform to address body image issues in a fun and empowering way.

During a conversation with Kadish, he pitched the initial title, “All Bass No Treble.” While Kadish was focused on the musical implications of the title, Trainor envisioned a deeper metaphor tied to body shape.

Trainor suggested incorporating a playful yet powerful message, explaining, “I told him, ‘Let’s just be confident in our skin.'” Together, they crafted lyrics that resonated worldwide:

“Because you know I’m all about that bass. ‘Bout that bass, no treble.”

The song’s success not only catapulted Trainor to stardom but also secured her a record deal, establishing her as a voice of body positivity in the pop music industry.

Trainor’s journey of transformation, both personal and professional, is deeply intertwined with her career as a musician and her dedication to family life.

In March 2024, she revealed her focus on fitness while preparing for The Timeless Tour, which wrapped in October. Speaking to People, she shared her excitement about being in the best shape of her life. “I’m feeling fit. I’ve never been so fit,” she said, crediting her family for supporting her health goals.

As she got ready for the tour, Trainor prioritized clean eating and consistent training to enhance her stamina for the stage. “I want to train and eat clean, and feel good when I’m dancing and singing,” she explained. “I don’t wanna be so winded, because right now, I’m winded.”

Trainor’s family life has been a cornerstone of her joy and motivation. She tied the knot with “Spy Kids” star Daryl Sabara in December 2018, and the couple shares two children: Riley, who turns 4 in February, and Barry, now 17 months old.

Trainor often shares snippets of her family adventures on social media, showcasing the love and laughter they share. In May 2024, she delighted fans with a heartwarming video of herself singing along to her track, “Whoops,” with Riley.

Later, in July, she celebrated Barry’s first birthday with an emotional post featuring adorable photos of the baby boy alongside his parents and older brother.

“MY SWEET BARRY BOY IS ONE!!! WHAT IS HAPPENING!? I blinked but also it feels like I’ve known you my whole life. We all love you so much! Thanks for all the beautiful smiles and sweet hugs and kisses. You are a gift,” penned the doting mom.

For Halloween 2024, Trainor and Sabara fully embraced the season by dressing up with their children as characters from “Paw Patrol.”

The family of four celebrated the day with playful energy, as Riley and Barry joined in the fun dressed as firefighters, radiating joy alongside their parents.

Meghan Trainor’s transformation journey, from her weight loss to her reflections on body positivity and self-improvement, highlights her commitment to growth and authenticity. She remains an inspiring figure, encouraging confidence and authenticity while balancing her personal and professional roles.