Nickelodeon Star Simon Curtis Shows Off 65-Lb. Weight Loss

Nickelodeon star Simon Curtis is showing off the results of his weight-loss transformation.

On Nov. 20, the 39-year-old singer and actor — best known for appearing in Nickelodeon’s hit 2009 musical Spectacular! — posted shirtless mirror selfies on Instagram highlighting his appearance before and after losing 65 lbs.

“Feel like a brand new person,” he wrote over the photo, before adding in the caption, “ 2025 to do list: -finish a monster album ✅ -transform ✅ 2026 here I come… 👀.”

In the comments section, Curtis received tons of praise for his toned physique from friends and fans.

“Total transformation Simon, I’m so very proud of you,” one person wrote, while another user said, “I’m Speechless! You’re my fitness goals.”

“I love that glow up 💕” one fan commented.

Curtis told the Daily Mail that he had reached his heaviest of 225 lbs. before deciding to start his weight-loss journey. He said he worked out regularly at his local Equinox gym and turned to peptide therapy.

Peptide therapy is a medical treatment that uses small chains of amino acids called peptides to improve certain biological processes like anti-aging, metabolism, muscle building, immune support and more.

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Curtis told the outlet that he started the treatment to help with various autoimmune issues, including Hashimoto’s thyroiditis, but continued as it helped with weight loss.

Although the musician hasn’t shared much publicly about his weight loss journey, he’s often posting photos while at the gym.

Earlier this month, Curtis flexed his muscles in a workout selfie on Instagram while thanking those who have helped him throughout his transformation.

“Feeling a completely new hot girl era loading and I’m so thankful for Pause in Joy reiki @pauseinjoywithpatti, @equinox, @dannygaribay, @joeab0ud, and all of the people/angels in my corner these days,” he wrote in the caption. “2026 is going to be so good 😏😈✝️⚡️”