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Heidi Klum Shares Precious Throwback of Her Youngest Son Singing for His 17th Birthday

The AGT Judge's son Johan was clearly a Katy Perry fan.

By McKenzie Jean-Philippe

America's Got Talent Judge Heidi Klum never misses a chance to share a sweet Instagram shoutout for her kids' birthday, even if it just happens to be the day before Thanksgiving.

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On November 22, Klum shared a precious candid throwback video of her son, Johan, enjoying a Katy Perry concert. In the clip, a young Johan sings along to Perry's famous song "Firework", unaware that his mother was filming the sweet moment.

"Happy 17 th Birthday Johan ❤️🥰🥳🥳🥳🥳🥳🥳🥳🥳🥳🥳🥳 Your even brighter than the moon," she said in a caption, referencing lyrics from Perry's hit track. She then continued on, using her son's full name. "I love you sooooo much Riley Fyodor Taiwo ❤️❤️❤️❤️❤️❤️ with all my heart 😍."

Johan is the model's youngest son with her ex-husband Seal. They also share kids Leni, 19, Henri, 18, and Lou, 14.

RELATED: Why Heidi Klum & Mel B Couldn't Stop Laughing During Their "Slumber Party" Together

Heidi Klum celebrates her kids

Leni Klum and Heidi Klum posing for camera's.

In October the model honored Lou's big day with precious newborn photos of her youngest daughter with the caption, "Happy 14 th Birthday LOU 🥰❤️🥳 I love you with ALL that i got ❤️."

Henry got a shoutout in September with a newborn photo of his own, and Klum acknowledging that he's grown quite a bit in his 18 years. "Henry Today you turn 18 🥳❤️ HAPPY BIRTHDAY 🎂 Look how small you were and now you are 6“3 WOW ❤️ I LOVE YOU WITH ALL MY HEART ♥️."

And in May, her oldest child and mini-me Leni — who's walking in Klum's footsteps as she pursues modeling — also got the Instagram birthday post treatment with a cute selfie of the mother-daughter duo posing with matching kissy-faces.

In 2022, Klum opened up to TODAY about her blended family and raising her kids after marrying husband Tom Kaulitz in 2019.

"I mean, it's never easy," she said. "Obviously when you get married and you have children, you hope for that to last forever. When I said 'yes' I meant yes forever. Unfortunately, that was not the case, and so you try to do your best to keep your children as happy as possible and keep them as grounded and loved most as possible."

RELATED: Heidi Klum Shared a Pic of Herself at Her Daughter Leni's Age and, Wow, They're Twins

And what do the four kids think of their mom's epic AGT Judging gig?

"I mean, I’ve dragged them to so many sets already, and unless there is someone on the set that they really care about... they couldn't care less," she said. "I think it's because I've always been on TV since they day they were born, and they've come so many times that, you know, it's nothing special to them at this point."