Jenna Dewan Celebrates Her 'Rainbow Baby,' Son Callum's First Birthday

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Jenna Dewan/Instagram Jenna Dewan and son Callum

Jenna Dewan is celebrating her son's first birthday!

On Saturday, the 40-year-old dancer and actress marked the special occasion with an adorable photo of her son, Callum Michael, smiling happily at the camera as he posed beside a throwback picture of himself from when he was born last year.

"I cut off half the frame while taking this picture because I was just too blown away…! The fact that this little angel baby is one years old today is blowing my mind," Dewan began the caption of her post.

"Callum, you came into this world and changed it the instant you were here… you brought with you pure joy, pure love and a little spark of the divine that I have a feeling will never leave," the mom of two said.

"You bring everyone around you together like the bright shining sun and we all want to bask in it all day. It is an absolute gift and honor to be your mommy...," she continued. "Sorry we can't have a birthday party for you, but I also feel that is a part of your magic... showing us all how incredible it is to slow down, focus on what matters and be together as a family."

Closing out her caption, the Step Up star wrote that she and her fiancé Steve Kazee — as well as her daughter Everly with ex Channing Tatum — "thank the universe for you every single day and we love you beyond our little rainbow baby!!!❤️🌈❤️."

Jenna Dewan/Instagram

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RELATED: 23 of the Most Adorable Photos of Jenna Dewan and Steve Kazee's Son, Callum

Dewan announced Callum's arrival last March alongside a black-and-white snapshot of herself holding her then newborn baby boy for the first time.

"And just like that, our hearts exploded into all of eternity and beyond ❤️🌈❤️ Welcome to the world you little angel! ❤️," she wrote at the time, before sharing her son's birth date and full name.

Jenna Dewan/Instagram

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Jenna Dewan/Instagram

While speaking with PEOPLE shortly after her son's birth, Dewan detailed that she felt very prepared and present for the joyous occasion.

"I'd heard this from a lot of people, that there's something that happens with the second baby, that there's a little bit more calm and peace in knowing what's happening," she said. "Knowing what's coming down the line, you are able to be a little more present and enjoy all of it and it's so true."

RELATED VIDEO: Jenna Dewan Shares Callum's Sweet Birth Story, Including Sanskrit Prayer Song: 'It Was Beautiful'

Jenna Dewan Shares Callum's Sweet Birth Story, Including Sanskrit Prayer Song: 'It Was Beautiful'

Jenna Dewan shares exclusive details and sweet photos of her newborn son Callum with fiancé Steve Kazee

At the time, Dewan also shared that her fiancé, who became a first-time father, was "incredible" throughout the entire experience.

"It was incredible to watch the awe in his eyes of experiencing birth for the very first time, and the first time he laid eyes on our son," Dewan recalled of Kazee. "He was crying the whole time and he cut the umbilical cord. Seeing his transformation of becoming a dad was one of the best things I've ever witnessed. It was beautiful. Birth is such a bonding experience, you're transformed at the end of it."